“It occurs to me that Tumblr is also growing exponentially with no apparent income source. I should look for a new home, pre-dickbar.”
That is an interesting problem, but before we worry about this we really should worry if they ever will get to the point where they need to worry about money. If they can’t get uptime issues solved, then there eventually (unfortunately) won’t be any users left. That would be a shame too, because Tumblr is a good platform.