I’m noticing a hell of a lot of tumblr spam. Even if these are link backs… That just sucks.
We noticed that too, so we killed them earlier this afternoon. If you notice, all of those accounts are suspended (they redirect to the Tumblr frontpage, the same thing that happens with nonexistent tumblelogs).
A slick new anti-spam system is in the works. It’s one of those awesomely challenging programming tasks that keep geeks like me interested.