I'm not happy by Google's dominance of search & email, and yet it is there. Here the matter is even worse due to the network effect: if most of your friends ar

I'm not happy by Google's dominance of search & email, and yet it is there. Here the matter is even worse due to the network effect: if most of your friends are using facebook's social tagging service, you'd have to be connected to it one way or the other.