I don't think I have ever viewed any content on Posterous. I didn't even know what it does until I started reading these comments. On the other hand, I get sent

I don't think I have ever viewed any content on Posterous. I didn't even know what it does until I started reading these comments. On the other hand, I get sent Tumblr links daily. Multiple times a day. If Posterous is the biggest competitor to Tumblr, it seems that says Tumblr has no real competition.