[rehack]

>and it still generates $4b p.a and climbing, imagine how good they would be if they actually figured this stuff out

Please also consider a counter case, what if $4b revenue i.e. roughly $4 per user per year, is the best you can have for such a product. And the potential for growth of no. of users is not high, then what?

[sanxiyn]

This seems very strange to me. There are social networks monetizing at much higher ARPU. Why is Facebook different?