Storified by The Stream · Wed, Oct 26 2011 21:59:43
Several other Facebook pages were launched in hopes of locating those displaced in the tornado.
--Critics say the decentralised initiatives are not very effective.
Are you relying on social media efforts to locate a family member in Joplin, Missouri? Share your sources with The Stream on Facebook and Twitter.
Thursday: How will Internet crackdown and social media surveillance impact the elections in Iran? Record a video for the show.
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