Pivotal Research Group's Brian Wieser's new analysis says online video is probably the biggest reason total online ad revenues grew by 18% in the third quarter. Indeed, he writes, "For now we think it's worth considering that online video advertising is growing faster than might be widely appreciated and well ahead of any changes in consumption." His new data says it's likely Google's YouTube will exceed $1 billion in ad revenue in 2012-up from $800 million just a year ago, most of it from US sales. That would mean, if the widely-followed Wieser's analysis is correct, that YouTube ad revenues ...Read the whole story