Phillip Todd Wilson, 54, faces 17 charges of child pornography possession and distribution.
The 23-year-old man accused of running the site, as well as hundreds of suspected users, have been arrested, U.S., British and South Korean officials said.
Pennsylvania state Sen. Mike Folmer (R) admitted to police "that he had received child pornography through his Tumblr blog,” according to prosecutors.
Pennsylvania state Sen. Mike Folmer admitted "he had received child pornography through his Tumblr blog.”
A case in Maryland illustrates how states are struggling to keep up with the changing realities of teenage behavior.
The former USA Gymnastics team doctor argues that punishments for his federal child pornography conviction violate constitutional protections.
The 26-year-old singer coerced six girls to send him sexually explicit videos.
The 54-year-old Iowa man allegedly told police he downloaded the images because he wanted to tell other people about them.
Bryan Rogers of Madison, Wisconsin, is charged with sexual exploitation of a minor.
Pennsylvania officials said it was the largest stockpile of child porn the state has ever seen.