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activity streams - an extension to the Atom feed format to express what people are doing around web

The Activity Streams format has already been adopted by BBC, Gnip , Google Buzz Gowalla , IBM , MySpace , Opera , Socialcast , Superfeedr , TypePad , Windows Live , YIID , and many others . http://activitystrea.ms/
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Check Username Availability at Multiple Social Networking Sites

Check to see if your desired username or vanity url is still available at dozens of popular Social Networking and Social Bookmarking websites. Promote your brand consistently by registering a username that is still available on the majority of the most popular sites. Find the best username with namechk . Blog About Us