At first glance I thought the title inferred that Tumblr hadn't increased in traffic in two years, which was very confusing. A better title would be something along the lines of "Tumblr now does as much traffic in one day as it used to do in one month."

I had the same confusion, and the sentence which explains it was less than clear to me - I had to reread it to be clear on what it was saying.

That's damn impressive.

I think if "09" was changed to "2009" it would be much clearer. Especially as the full year is already used for 2011 in the same headline.

Really bad title, were you trying to optimize it for twitter?

On the first read it sounded (to me) like nothing had changed, it wasn't until I actually clicked through and read the full headline that it made sense.

holy fucking wow. I knew that tumblr rocked, but not that much.