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Yahoo (YHOO) announced its first acquisition under CEO Marissa Mayer on Thursday, a New York-based mobile startup named Stamped that was founded by two former Google (GOOG) employees and received financing from celebrities including Justin Bieber.

Yahoo Inc's new CEO Marissa Mayer sketched out her plan for revamping the mobile and search advertising business, outlining publicly for the first time her vision for getting the ailing Web company back on its feet.

Google Inc. will continue to provide the search results on AOL Inc.'s websites under a new, five-year deal the companies signed this week. The agreement largely reinforces an arrangement that has been in place between the two companies since 2005. But the new contract, announced Thursday, also expands their cooperation onto AOL sites for cell phones and other gadgets. And it will put AOL video content on Google Inc.'s YouTube site for the first time.

Nokia and Yahoo — two market leaders struggling to keep up in the US mobile market — joined forces Monday, announcing that Nokia would use its purchase of mapping giant NavTek to power Yahoo's map and navigation services globally ...

Its search engine now in the hands of Microsoft, Yahoo plans to focus on display ads, content and mobile services.