Facebook has just bought video ad tech startup LiveRail, which connects marketers to publishers on web and mobile to target 7 billion video ads to visitors per month. A source tells us Facebook paid between $400 million and $500 million for LiveRail, but Facebook refused to comment on the terms. [Update 3:30pm PST: Another source now tells us LiveRail sold for $500 million, matching the $400 million to $500 million range I reported earlier.]
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