Tumblr is, globally, in the top 50 websites by traffic, and in certain major cities it's in the top 20. Yeah, it's mostly full of cats, angst and porn, but the

Tumblr is, globally, in the top 50 websites by traffic, and in certain major cities it's in the top 20. Yeah, it's mostly full of cats, angst and porn, but the user base is both large and dedicated.