Authors and publishers have been using online video to build engagement with readers and find new ones. With traditional book publicity oportunities and store signings on the wane, an online strategy is a necessity.These videos reside on destination sites, on publisher sites on author pages and social networks.At the Mediabistro eBook Summit this week, I caught up with Jill Bauerle, Executive Producer and founder of New York-based start-up called Stackedup.tv which is producing and distributing author videos.A big player in this field is Emeryville, California based TurnHere.Andy Plesser, Executive Producer Less