Web 1.0: Global reach to content publishing.\ Web 2.0: Web becomes a two-way publishing avenue: readers contribute content and play central role.\ Web 3.0: Let's try make sense of the enormous content published. Smart aggregation becomes key.

It looks like the reality in which content aggregation plays equally important role, compared to publishing, is arriving quietly but steadily:

Image courtesy of Amazon Web Services Blog

P.S. Thanks to Doug for pointing to the blog post.