I hope you know who actually facebook‘s news feed works on your profile section. When any of friend change anything or updates anything instantly you also get an message on your news feeds.
Like as Spokeo do the same work but largely and across the web more then 22 largest social network already they covered. That means, on digg, bebo, friendster, linkedin, netlog, last.fm, twitter, picasa, hi5, facebook or etc any of your friends if they chage any of their content’s you also can easily track your Spoleo account and nowadays Spokeo upgrading their service and till now including new and new social networking site.
Relevant Posts: [techcrunch]