Posterous: Posterous is a site that allows anyone to post any item of interest to the Web at any time, then provides the user with a custom URL that they may then share via their social networks. Acting as a sort of hybrid of a blog and Twitter, all a user has to do is send an e-mail with an attached photo, video, MP3, or other file, to the generic inbox. The site instantly responds to the user’s e-mail with a custom URL that will host whatever file that was sent. Similar to services like TwitPic, Posterous users’ information can be shared instantly and publicly.

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Ning, API, Lifecasting, Crowdsourcing, Meme, Social bookmarking, Trackback, Twitter Grader, Authority, TweetBeep, Compete, Astroturfing, WEGO Health, BackTweets, PDR.net, socialmention, Twazzup, Health Exchange, Health Tweeder, DIDGET, Thoora, Google Buzz, bit.ly, E-patient, Alltop, mHealth, Augmented reality, OpenID, ROI, #hcsm, Medpedia, Almost.at, Hashtag, FollowFriday, Beta, Microblogging, Sidewiki, Meta tags