The great blog, Web 2.0 Aggregators, Putting the Pieces Together, (great title btw)

set up by James Briano and Jeff Munson explains in great detail exactly what website aggregators are. Applications that monitor websites, gather data, and assemble the data gathered in a format that you specify. Examples of desktop and Iphone applications that allow you to bring together all your social websites, Flickr, Twitter, MySpace, Facebook, etc.
It seems as if that was the many topic at 2009 Web 2.0 Expo. A lot of companies pushing aggregators.
So why aren’t social websites like Facebook or Flickr adding this feature to their own sites? That way they can keep users on their own sites instead of going to sites like Nomee where everyone will be looking at their Facebook or their Flickr through the Nomee interface. Keep users where they are! I say add aggregators to all sites!