Out of the real time search engines out there, FriendFeed is the one that already has an established and growing community behind it.

People are using it. Now that its realtime search functionality is here, expect people to use that plenty.FriendFeed has climbed significantly over the last year in terms of unique visitors. There is a good chance it will continue to grow as the web continues its trend of becoming more social and people look to consolidate their social media streams.