> eMarketer came to the $150 million figure by comparing Twitter with Facebook, which had ad sales of about $150 million in 2007, right after it got serious abo

> eMarketer came to the $150 million figure by comparing Twitter with Facebook, which had ad sales of about $150 million in 2007, right after it got serious about selling ads. So that number is meaningless. Twitter and Facebook advertise totally different, and everyone visits Facebook directly, whereas many get Twitter via 3rd parties.