synopsis: Twitter has acquired web security firm Dasient, in a move which could make clicking on URLs in the social network a little safer. Dasient's technology scans web addresses to detect harmful content, and the company also operates a service aimed at keeping online advertising free of malware.

synopsis: Global digital security software company, Clearswift Ltd., headquartered in Theale, has been acquired by mid-market growth investor Lyceum Capital. Clearswift’s integrated products manage inbound threats, data loss prevention, web access policies and compliance across both web and email communications.

synopsis: Zeus Technology, the pioneers of Application Delivery Controller software, announced it has purchased the assets of art of defence, a German-based distributed web application firewall provider. By coming together, they can ensure they continue to push the pace of innovation for their customers, while providing them with the best support team.

synopsis: Webroot Software, Inc., a leading provider of security software for the consumer, enterprise and SMB markets, has merged with Email Systems, a leading Software as a Service security provider. Consequently, Webroot moves decisively into providing security SaaS solutions to enterprise organizations, particularly SMBs.

synopsis: ANXeBusiness Corp., a provider of networking and managed security services, acquired ETSec, Inc., a provider of security solutions and managed security services. The ETSec acquisition marks ANXeBusiness' sixth purchase since 2006 and further strengthens the combined company's position in the global security-as-a-service markets.

synopsis: Cisco announced that it has completed its purchase of ScanSafe, Inc. Based in London and San Francisco, ScanSafe is a market leader of software-as-a-service (SaaS) Web security solutions for organizations ranging from global enterprises to small businesses.

synopsis: Symantec Corp. announced it has completed its acquisition of VeriSign's identity and authentication business, which includes the Secure Sockets Layer (SSL) and Code Signing Certificate Services, the Managed Public Key Infrastructure (MPKI) Services, the VeriSign Trust Seal and the VeriSign Identity Protection (VIP) Authentication Service.

synopsis: Purewire, Inc., a SaaS-based Secure Web Gateway vendor that protects business and social interactions on the Web, announced it has acquired Opinity, a pioneer in online reputation management.

synopsis: TRUSTe, the leading trustmark and recognized authority on Internet privacy announced the acquisition of Haute Secure, developer of innovative web site scanning and anti-malware technology. The move will further advance TRUSTe's technologies for certifying web privacy practices and protecting consumers.

synopsis: Computer Software Innovations, Inc. a provider of software and technology solutions to public sector organizations, announced that it has acquired software developer Version3 based in Columbia, SC.

synopsis: Richard Helms, CEO and Founder of Abraxas Corporation today announced the acquisition of San Diego-based Anonymizer, Inc.

synopsis: Grisoft, developer of the AVG family of security software products, announced the acquisition of Exploit Prevention Labs, a pioneering developer of safe surfing technology that protects Internet users against malicious web sites and drive-by downloaded exploits. Terms of the acquisition were not disclosed.

synopsis: Websense, Inc. closed its acquisition of SurfControl plc, as the scheme of arrangement relating to the recommended offer for SurfControl plc, at a price of 700 pence per share, has now become effective. The final purchase price is approximately pounds Sterling 204 million, including deferred compensation and stock option expense.

synopsis: Cybertrust, the global information security specialist, announced that its squeeze-out to purchase the remaining shares of Ubizen, its majority-owned subsidiary, has concluded. This represents that the merger and integration of Ubizen into Cybertrust is complete.

synopsis: Secure Computing Corporation, the experts in securing connections between people, applications and networks(TM), today announced it has completed its merger with CyberGuard Corporation, a global provider of security solutions that protect the critical components of the largest and most complex information networks.

synopsis: HP has signed a definitive agreement to acquire SPI Dynamics, Inc., a leading provider of web application security assessment software and services, to further strengthen its leadership in the IT application quality management market.

synopsis: Verizon Business is now the leading provider of managed security services to business and government customers worldwide with the completion of its previously announced acquisition of Cybertrust.

synopsis: Trend Micro Inc., a global leader in Internet content security, has announced that it has completed the acquisition of Mobile Armor, Inc., an innovator and leader in data encryption and mobile device management technology.

synopsis: McAfee, Inc. has completed the acquisition of all the outstanding capital stock of SafeBoot Holding B.V. for approximately $350 million in cash. Through the acquisition, McAfee(R) becomes a leader in the data protection market and the only vendor to deliver endpoint, network, Web, e-mail and data security, as well as risk and compliance solutions.

synopsis: Juniper Networks, the industry leader in network innovation, announced it has acquired Mykonos Software, the leading provider of Intrusion Deception Systems that protect websites and web applications. Mykonos Software is the first technology that inserts detection points to proactively identify attackers before they do damage.

synopsis: Twitter has acquired web security firm Dasient, in a move which could make clicking on URLs in the social network a little safer. Dasient's technology scans web addresses to detect harmful content, and the company also operates a service aimed at keeping online advertising free of malware.

synopsis: Twitter has acquired social media analytics and data company, Hotspots.io. The Hotspots.io team, who are now part of Twitter’s “revenue engineering team,” includes Matt Huang, Alexander Spicer and Ashutosh Singhal. The company focuses on “social media intelligence you’ll actually use.”

synopsis: Twitter Inc. has acquired Posterous, a blogging platform known for its slick digital media-sharing interface. The microblogging service said in a blog post that the Posterous staff "has built an innovative product that makes sharing across the Web and mobile devices simple.

synopsis: Twitter has acquired web security firm Dasient, in a move which could make clicking on URLs in the social network a little safer. Dasient's technology scans web addresses to detect harmful content, and the company also operates a service aimed at keeping online advertising free of malware.

synopsis: Twitter has acquired Summify, a Canadian company that created one of several mobile apps that automatically scan the flood of news stories being shared across all social networks. Summify helps people and organizations consume, discover and publish news more efficiently.

synopsis: Twitter has acquired Whisper Systems, a a two-person mobile security software development firm that was founded in 2010. Whisper Systems develops security software for mobile platforms which is focused on protecting data in transit and at rest. Its two offerings are TextSecure and RedPhone.

synopsis: Twitter has acquired Bagcheck, an online service where people create lists of items that interest them, such as cameras they've used or their favorite cold remedies, and share the lists with others.

synopsis: Twitter has acquired TweetDeck, an application for organizing the display of tweets, for more than $40 million in a mix of cash and stock, according to sources close to the deal.

synopsis: Twitter announced that it has acquired Web analytics company Smallthought Systems. Smallthought produced Dabble DB, an online database that Twitter once used to share information about its projects internally. Smallthought also created Trendly, a tool that helps users sift through their Google Analytics data.

synopsis: Twitter has acquired TweetDeck, an application for organizing the display of tweets, for more than $40 million in a mix of cash and stock, according to sources close to the deal.

synopsis: Metaswitch Networks, a multi-award winning supplier of next generation infrastructure and applications to network operators, announced the acquisition of Colibria, the leading independent provider of enhanced instant messaging, presence and network address book solutions.

synopsis: Google has acquired voice messaging startup SayNow. SayNow’s platform allows voice messaging, one-on-one conversations, and group calls to be integrated into Facebook, Twitter, MySpace, Android, or iPhone applications.

synopsis: Good Technology, the world's leading provider of push mobility solutions, announced that it has acquired Intercasting Corporation, the leading mobile social networking connectivity company in the U.S.

synopsis: PostUp, the social media platform founded by Internet entrepreneur Bill Gross, announced that it has acquired UberTwitter, the leading Twitter client on the BlackBerry platform. UberTwitter is also available for iPhones.

synopsis: TweetUp, Inc., announced that it had acquired Twidroid. The company also announced that the application will be renamed Twidroyd in order to ensure minimal confusion with products from Lucas Films, trademark owner of the term “droid,” and will come standard on millions of upcoming Android phones from five of the leading handset manufacturers.

synopsis: Myriad Group AG, a global leader in mobile technology with software in over 2 billion phones, announced that it has acquired the brand, technology and 17 employees of privately-held Xumii, Inc., a provider of mobile social networking services based in San Mateo, California and Sydney, Australia.

synopsis: Tucows Inc. today announced the successful completion of its acquisition of Mailbank.com Inc. (DBA NetIdentity), effective today. Consideration for the transaction was approximately US$18 million, payable in a combination of cash, promissory notes and the issue of approximately 3,603,000 shares of common stock to the stockholders of NetIdentity.

synopsis: Synacor, Inc., provider of the leading technology platform enabling cable, satellite, telecom and consumer electronics companies to authenticate their consumers and deliver digital entertainment, TV Everywhere and online services, has acquired Carbyn, the HTML5 Platform that delivers a unified experience for apps across Net-connected devices.

synopsis: Twitter Inc. has acquired Posterous, a blogging platform known for its slick digital media-sharing interface. The microblogging service said in a blog post that the Posterous staff "has built an innovative product that makes sharing across the Web and mobile devices simple.

synopsis: Openwave Systems Inc., the leading independent provider of software solutions for the communications and media industries, has completed the acquisition of WiderWeb Limited, a leading developer of mobile web access solutions.

synopsis: Security expert Avira announced that it has acquired SocialShield®, the top-rated parental monitoring service for keeping children and teens safe while using social networks. Avira will incorporate SocialShield’s social network monitoring technology into Avira’s free security product portfolio.

synopsis: Backupify, the leading provider of online backup, archiving and export services for cloud-based data, announced the acquisition of privately held TweetBackup. The popular Twitter backup service currently performs automated daily backups of over 62 million Tweets for thousands of users.

synopsis: BigString Corporation - whose patent-pending technology permits sending recallable, erasable, non-printing and self-destructing emails - announced that it has closed a $2 million round of financing by Tudor Investment Corporation and its affiliates.

synopsis: CrowdGather announced a definitive agreement to acquire the technical assets from Lefora. The CrowdGather network combined with Lefora’s hosted forum properties will offer a search engine and social media-friendly network of forum communities that serves over 90 million monthly pageviews.

synopsis: Microsoft Corp. has closed its acquisition of Skype Global S.a r.l. Skype is the leading Internet communications company. With an Internet-connected device, families, friends and colleagues can get together for free with messaging, voice and video using Skype.

synopsis: AOL Inc and Digital Sky Technologies Limited (DST), the largest Internet company in the Russian-speaking and Eastern European markets, announced that they have reached an agreement for DST to acquire ICQ – the leading instant messaging service in Russia and a number of other international markets – for $187.5 million.

synopsis: eBay Inc. announced that it has successfully completed the previously announced sale of its Skype communications unit. The buyer, who will control an approximately 70 percent stake, is an investor group led by Silver Lake and includes Joltid Limited and certain affiliated parties, the Canada Pension Plan Investment Board and Andreessen Horowitz.

synopsis: eBay has completed its previously announced acquisition of Skype, a communications platform provider whose purpose is to break down barriers to communication. With an Internet-connected device, families, friends and colleagues can get together for free with messaging, voice and video using Skype.

synopsis: Trivantis, the company behind the successful Lectora eLearning brand, announced its agreement in principle to acquire its partner Flypaper Studio, Inc., providers of the leading Flash content creation and digital signage platform.