After friends advised her to start a Tumblr about something, author and Funny Ha-Ha cofounder Claire Zulkey created Obesity Stock Photos: an archive of photographs used to illustrate articles about one of America’s most popular health conditions. “The subject of people being used to illustrate stories on weight has always struck me as weird, and something I intended to blog about, and Tumblr/Google alerts just made it easy to do,” she explains via e-mail.