NBC's Horst Stipp pointed out that while the online video audience isnt as large as thought, even if doubled, it represents a highly engaged audience."A lot of the full-length programming watched on Hulu or a network site are being watched by fans of the show so you have a very engagedd aud that takes the deliberate step of going to a Web site to see something they want to see," he said. The fact, for both networks and advertisers, that you're reaching a loyal fan base online is important, according to Horst.