Nivi has a good post on defining the different types of Web 2.0 customers. He says:
You can break down Web 2.0 customers into a fuzzy hierarchy:
Creators who create an “original” work.
Examples include a reporter at the New York Times, a podcaster, a
blogger who is writing original content, or the author of Harry Potter.
Linkers who annotate the work of Creators.
Examples include a blogger who mostly links to other content or a
del.icio.us user who publishes the RSS feed of his bookmarks.
Commenters who comment on the Creator’s and Linker’s work. Examples include anyone who writes a comment on a blog.
Surfers who consume the output of Creators, Linkers, and Commenters. Anytime you read someone’s blog, you are a Surfer.