The long tail of social networks

Here's an interesting post about some key metrics for social networks. This is an expansion of Compete's rankings released last week. To me, what this really shows is that people use the sites very differently. Whereas sites such as Orkut, Facebook and Myspace clearly get very high repeat frequencies from heavy user-to-user interaction, other sites with lower ratios probably attract more casual browsers. That's not necessarily a bad thing, just something to keep in mind when you try to evaluate these sites.
Joining Dots: Social Networks Long Tail