Tim Oreilly has done some data crunching and has a graph showing the distribution of Facebook application use. He describes it as a long tail which is misleading because there is no way for any one business/entity to aggregate the long-tail into something useful – besides Facebook themselves which illustrates how smart their platform play is.

But it’s great data. Combine this with the average ad CTR of 0.04% on Facebook (which is relevant for widgets because they’re subject to the same CTR’s) and it makes one wonder why anyone would want to play in that sandbox.

The other interesting thing about the graph is that it’s a who’s who of Facebook: