Facebook is about to take its most intrusive advertising to a new medium ? video ? and it could be the most annoying yet. Un-skippable Facebook video ads might seem like the greatest innovation in decades for major marketers, who have been coping with diminishing and fragmented television audiences for decades. Facebook says 88 million to 100 million people are on the service during primetime TV hours, almost as many people who watched this year?s Super Bowl. But users might revolt; it?s happened before, many times before. After all, people are flocking to social networks to see cute pictures and silly posts from friends and family, not to sit through ads for pickup trucks, allergy pills and fast food.