FriendFeed is using Long Polling Push Technology now

Friendfeed implemented the new feature tonight. Users can choose to view most of their FriendFeed pages in real time, including topical based pages.
Robert Scoble says: "This is wild. It’s like the web has been turned into a chat room", and I agree.
Push technology, or server push, describes a style of Internet-based communication where the request for a given transaction originates with the publisher or central server....
blog.friendfeed.com
many other services are using long polling, eg. blip.fm, plurk.com, ping.fm, soup.io, facebook.com, etc...
via | tags: friendfeed long polling web chat
Labels: collaboration, friendfeed, microblogging, networking, sharing, social_software, web_2.0, web_apps