I think the statement meant the company is trying to enforce PC, starting with porn, to the detriment of the existing userbase.

It's as dumb a move as you can possibly make; I don't know what the decisionmakers behind were smoking, but it must have been something strong.

I know what they meant, I'm confused at the accusation of it being politically correct.

You're not confused, and you felt the irony in my post. I wrote it's trying to be PC, and I didn't touch base upon what PC actually means - it's a broad term, different in everyone's eyes. Yes, Tumblr is bowing down to someone's standards, I called that PC, you are bothered by that statement - let's agree we disagree but you got the big picture and that's what matters.

That's fair, tumblr is very much being politically correct in that sense. I'm just so used to it being a right-wing insult against basically anything leftist.

Politics wakes strange bedfellows. There is no single coherent definition of acceptable behavior. All corners raise hell for what they consider unnacceptable. PC isn't exclusively left-wing.