| http://www.w3.org/ns/prov#value | - users.Members of the leading social network can use the application to make online vows to vote and then remind friends to do the same, according to a Twitter message from @BarackObama, an account run by the president's campaign staff.Obama ran the most technology-savvy US political campaign in history four years ago, leveraging social networks, e-mail, text messages and other media to build a vas
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