The best thing about Tumblr isn't just the ease of use, the overabundance of cat pictures, or the constant barrage of memes (or even the chicks in Star Wars shirts); no, it's the naked folks. And all for the low, low price of FREE.

This graphic from a few years back shows the number of pornographic sites that have proliferated on Tumblr. Simply put, looking at your Tumblr stream at the office is a harrowing task, that is if your job frowns on random hipster nudity or sites dedicated to old-school Playboy centerfolds.