Investor Blasts Yahoo Over Tumblr Strategy, Calls for AOL Merger

Yahoo is under pressure to merge with AOL as an activist Wall Street fund pushed today for big changes at the Internet advertising giant. The hedge fund, Starboard, wrote a letter to Yahoo's board with a list of demands to reinvigorate the business.

Too Legit to Quit: Uber Raises $1.2 Billion

Despite nagging questions about its legitimacy and its future, the hot car service/tech startup Uber just raised $1.2 billion.

Twitter Still Finding Its Wings in Bumpy IPO

So much for a smooth flight:  Twitter’s public debut hit some turbulence on day two.The much-hyped Wall Street offering started Thursday, after Twitter lined up investors to sell 70 million shares at $26 a piece. Shares jumped in the opening minutes of trading to as high as $50, but that was as good as it gets.

PubMatic Raises $45 Million With IPO, Acquisitions in Mind

PubMatic raised $45 million in its latest funding round. The supply-side platform’s co-founder and CEO Rajeev Goel said the new investment “adds heft to the balance sheet” as the company eyes acquisitions in the mobile, video, data and brand control sectors that will build out its position in relation to competitors like Rubicon Project.

Groupon Tries to Assuage Stockholder Fears

Groupon CEO Andrew Mason wants you to know everything is O.K. At least that's what he told stockholders today in a four-page letter that reads more like a plea to stay than a bold vision for the future.