Because on others there is more to do than simply communicate. On Facebook you can find events, locations, fans, and such. On Myspace you can listen to bands an

Because on others there is more to do than simply communicate. On Facebook you can find events, locations, fans, and such. On Myspace you can listen to bands and music. So there is stuff to do before you've built up a network, on Twitter it's vacuous when you don't have that many friends or people you're following.