If people weren't too happy with the first batch of sponsored posts by Instagram, those temper tantrums might reach a new level soon. According to Adweek, the Facebook-owned imaging service is now rolling out video ads to users' feeds, having been quietly testing them for the past six months. So, starting today, don't be surprised to unexpectedly run into a random 15-second video while you're trying to find a picture of the next great brunch. As it stands, Adweek points out that Instagram is pushing motion ads from Activision, Banana Republic, CW and Lancome, but chances are you'll start seeing others from more companies as time goes on. In the meantime, head on past the break to check out what you can expect -- because you're dying to know.