Ha! Well.
For my part, such blogs are odious. If you've found help thru some, great. I've never lingered long enough to see any good, and didn't want to. I hadn't the belly for it.
If these types of blogs vanish from Tumblr, yay. They suck and are destructive, but what about pro-drug blogs? I have seen one extolling the virtues of meth on here. Is that next? Tumblr should make CRYSTAL clear (har, har—get it?) what they intend to do regarding these self-harm blogs (never gonna happen). Censorship is a slippery slope.