Is that the Tumblr which is chock-full of straight porn?
I don't necessarily endorse MichaelAnissimov's take on this particular issue, but Tumblr's a big site. You can find everything from cat picture blogs to literal Nazis on it if you look. That doesn't mean it's disproportionately cats (plausible) or Nazis (very improbable), though, nor that people are talking about cat pictures or antisemitism when they complain about Tumblr culture.
More specifically, there are basically two things you can easily use Tumblr for: image sharing and text microblogging. The former lends itself well to porn, the latter to radical politics, and the communities built up around these use cases don't overlap all that much.
Through LessWrong, I've discovered the no-reactionary movement. Servery says that there are some of you here.
I'm curious, what lead you to accept the basic premises of the movement? What is the story of your personal "conversion"? Was there some particular insight or information that was important in convincing you? Was it something that just "clicked" for you or that you had always felt in a vague way? Were any of you "raised in it"?
Feel free to forward my questions to others or direct me towards a better forum for asking this.
I hope that this is in no way demeaning or insulting. I'm genuinely curious and my questioning is value free. If you point me towards compelling evidence of the neo-reactionary premise, I'll update on it.