The article doesn't clarify running costs for Tumblr. Might help us put things in perspective-- why is $13,000,000 in advertising revenue troublesome?
It sounds almost like they were following the Digg engineering approach rather then Reddit's.
A lot of "brand strategists"
Is that a fancy title for someone who interacts with the tumblr community? I noticed they're located all over the place.
I wish I could point you at some better sources but that's the best I can remember sorry.
An average salary of $55,000 seems a bit low but not by too much. I'd guess that $13m is right around their employee cost. If that's true, the rest of their cash must be funneled towards tech and advertising.