Barack Obama wins second term in White House

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US President Barack Obama, who pioneered online electioneering, claimed victory in his re-election battle Tuesday with posts on his Twitter and Facebook pages.

"This happened because of you. Thank you. Four more years," he tweeted on his official account, signed with his initials 'bo' to mark it as a personal message, in a response that was quickly 'retweeted' 88,000 times.