They’re the destinations that have taken over the internet and turned us all into social-networking, video-uploading, photo-sharing Web 2.0 addicts. Everyone contributes content and everyone has a voice. Or so we’re told.

In reality, it seems the new internet, where user-generated content is the key, is not being adopted as quickly as the marketers would have us believe. New stats from web analysis firm Hitwise show that the proportion of people actually using sites like YouTube, Flickr and Wikipedia for their prime purpose – contributing videos, sharing photos and editing articles – is far from impressive.

Only 0.16 percent of YouTube users upload videos to the site, while just 0.2 percent of those visiting Flickr add photos to Yahoo’s photo-sharing destination. Wikipedia users are by far the most devoted to the cause, according to Hitwise’s figures, with 4.5 percent of them editing Wikipedia’s online articles.

Clearly, we’re still talking about millions of active Web 2.0 users, but it looks like the concept is far from being mainstream. Is Web 2.0 over-hyped, or simply not as mature as the likes of Google and Yahoo would have us believe?