Sources close to Microsoft say the company's bankers have begun signaling to Facebook CEO Mark Zuckerberg interest in acquiring his company. "We just want to gauge their interest, more than any real effort," one source told Kara Swisher, who first reported the news. These bankers figure there's little chance Zuckerberg will agree to sell to anyone but the public in the next few years, but that "putting out subtle signals," as Swisher reports the bankers call them, is worth the effort if they pay off. Last fall, Microsoft purchased 1.6 percent of Facebook for $240 million. Unsolicited advice for Zuckerberg: Be careful with the high-fives.

Sources tell Valleywag that lifecasting startup Ustream.tv is in advanced discussions with Microsoft to acquire the lifecasting service for more than $50 million, but there are other companies in the bidding as well. Ustream is currently raising a very large initial round of VC financing, and Microsoft is attempting to grab them prefunding for a cheap price. Our tipster also mentions that Microsoft would use Ustream as a way to promote its Adobe Flash competitor, Silverlight. Ustream has raised around $2 million from angel investors, and seems to have hit the market at just the right time.