The companies, both private, did not disclose the financial terms of the deal. FriendFeed and Facebook already had a relationship in which Facebook users could access the FriendFeed application from within their Facebook profiles.
FriendFeed was founded in 2007 by four former Google employees, including Paul Buchheit, the engineer behind Gmail and the originator of Google's now-infamous "Don't be evil" motto; and Bret Taylor, a former group product manager who launched Google Maps.
The two companies share a common mission in that they allow people to interact on the Web by sharing information -- including links, photos and videos -- for discussion among a group of online friends. Facebook has some of the capabilities of FriendFeed but is not limited to them, so it's unclear exactly how the two services will be integrated.
FriendFeed's 12 employees will move from the company's headquarters in Mountain View, California, to Facebook's Palo Alto headquarters, but the site will continue to operate as usual until the companies decide on a long-term integration plan, according to the companies.