In which I do not feel old.

Given that I still actively promote my YA works, I spend entirely too many hours on Tumblr.  With what I would average my 8,000+ followers age to be at around 19, I am in a considerably different demographic.  Happening upon the below graphic, I felt instantly better about my involvement as I am the EXACT average Tumblr user.  For all others, I am skewing younger by a few years, but for some reason the Tumblr data somehow qualified all of the hours I spend on the sight in a week day.

What platform of social media do you spend the most time on?