BBC NEWS | Technology | Facebook in challenge to Google
Many expected Google or even Twitter to buy the company, which has been praised for its "real-time" search engine.
This type of search is valuable because it lets you know what is happening right now on any given subject.
"Google look out, Facebook knows the real money is in real-time search," said respected blogger Robert Scoble.
"Google is the king of regular search. FriendFeed is the king of real-time search. This makes the coming battle over this issue much more interesting," Mr Scoble told the BBC.
Back in May, Google founder Larry Page admitted that the search giant had fallen behind other services like that of Twitter, which boasts nearly 45 million users worldwide.
"People really want to do stuff real time and I think they (Twitter) have done a great job.
"We've done a relatively poor job of doing things that work on a per second basis," Mr Page said at the time.