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+2 votes
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Q2A version: 1.4

2 Answers

+1 vote
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Not currently possible. Perhaps someone will develop a plugin for it...
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I use Buddypress integration, and developed a custom plugin that updates the "Who's Online" sidebar widget every thirty seconds, does just this.  Something like that might be a good place to start (sorry, not me...).
+1 vote
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My suggestion is http://whos.amung.us/ . Nots really exatly what you want but...

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