Twitter Statistics: Only 0.05% Of Users Actually Matter

"First, we find that although audience attention has indeed fragmented among a wider pool of content producers than classical models of mass media, attention remains highly concentrated, where roughly 0.05% of the population accounts for almost half of all attention."

Almost half of twitter attention is for the 20K users. Yes, big media, celebs and blogs.

Its that 20K users that make for Twitter's SuperBowl moments.. All that Twitter advertising ROI would need to revolve around that 20k users.

Statistics Source: Yahoo Research