Singular and huge fame like we've seen on in pop culture is a result of the medium - TV, radio, print. The web doesn't work that way - we're not all watching the same thing at once.

When you are dealing with few-to-many medium (TV, radio, print), you get a few people known by many: fame.

When you are dealing with a many-to-many medium (the web), you get smaller groups of people who are known by eachother.