This is certainly true for me, though whether that adds to the credibility of this research I don't know. But a report by Harris Interactive says that Americans who consider themselves 'hard-core YouTube users' also claim their TV viewing has fallen by about a third since becoming hooked on the video sharing site. Though, of course, half the stuff they are watching on YouTube may well have originated on a TV network.
The survey showed that 42% of American adults who use the web have watched a video on YouTube, while 14% called themselves frequent visitors. It was that subsection that watched up to a third less TV as a result of their use of the site.
The popularity of YouTube seen in the survey is good news for the video sharing site, although the survey also found that 73% of users said they may use it less if short video ads were slotted in before videos aired, having become "accustomed to finding and watching everything for free".