Sites that enable users to create, collaborate on, and share contributions are among the top 10 fastest growing destinations on the Internet, reports Nielsen/NetRatings. They include:

• ImageShack (photo hosting): 233% growth in traffic over
  last year
• Flickr (photo sharing): 201%
• MySpace (community free-for-all): 183%
• Wikipedia (collaborative encyclopedia): 181%

Nielsen’s
press release has more details (a PDF document).

The message for editors and publishers: If you want to grow your
audience, find ways to build social computing activities into your site.