Direct attacks and unprovoked hostility are usually reserved for gossip blogs, not the people who make the platforms that power them.
But Posterous, the blog service that lets users post using e-mail, did just that Tuesday, taking a shot at a platform called Tumblr on its company blog. The headline: “Hey Tumblr users: Want comments? Need privacy? Graduate to Posterous.”
“Blogging on Tumblr is sort of like being in high school,” the statement reads. “But you know deep-down that you can’t be in high school forever. Eventually, you have to move on.”
Me? I’m a Posterous guy! What about you?
Bright, shiny objects! 
What do you think?