Klout makes its first acquisition: Local-mobile app Blockboard

Klout, the San Francisco-based startup that measures people’s “influence” across a variety of social networks, has made its first acquisition with the purchase of Blockboard, a Twitter-like mobile app that functions as a community bulletin board for posting messages viewable to your neighbors.

Web app security startup Unsubscribe.com sells to TrustedID

Unsubscribe.com, the Los Angeles–based startup that makes security and privacy tools for email and social networking applications, has been acquired by TrustedID, a Palo Alto, Calif.–based credit and identity protection technology firm. Financial terms of the deal have not been announced.

Salesforce buys Model Metrics in mobile and social push

Salesforce.com on Monday announced its acquisition of Model Metrics, a company that provides mobile and social cloud consulting services. Financial terms of the deal have not been disclosed. The deal will “add mobile and social expertise” to Salesforce’s current offerings, the company says.

Facebook’s new acqui-hire: HTML5 mobile app startup Strobe

Facebook announced Tuesday its latest talent acquisition: Strobe Corp., a San Francisco-based mobile app development startup focused on HTML5 apps. Strobe was born out of SproutCore, an open-source JavaScript framework built by engineer Charles Jolley in 2007 while he was a full-time engineer at Apple

Notable: LSI buys SandForce for $400M

Venture capitalists have generally given semiconductor startups the cold shoulder for years now in favor of the web and software spaces. But LSI Corporation’s $400 acquisition of VC-backed chip startup Sandforce could encourage more VCs to warm up to chip technology once again.

Cardpool acquired by Safeway’s gift card division

Cardpool, the San Francisco-based startup that lets people buy, sell and trade unused gift cards, has been acquired by Blackhawk Network, a wholly owned subsidiary of grocery giant Safeway. Details about the deal are scarce, but Cardpool co-founder Anson Tsai says his investors “are quite happy.”

Yahoo investors have questions, but execs don’t have answers

With all the buzz around Yahoo recently, its financial conference call with analysts and investors could have been a big event. But interim CEO Tim Morse made it clear that investors looking for answers about Yahoo’s CEO search and M&A options were out of luck.

HP-Autonomy deal nearly done

Autonomy’s impending acquisition by Hewlett-Packard is nearly done. The controversial $10.3 billion deal was cleared by regulators in the U.S. and Australia on Thursday, according to reports. Autonomy shareholders still have until Monday morning 10:00 a.m. U.K time to weigh in.