Wow, they've definitely gone on a spam-killing spree recently. Following that scandal a few weeks back where someone had, uh, "inappropriate" downloads in their checked-in public .bash_history, I did a few searches and found insane amounts of spam in github pages.

It's all gone now, as far as I can tell. You can view the lingering google results with a porn-themed search like "site:github.com pthc"†.

Typical cached result: hxxp://webcache.googleusercontent.com/search?q=cache:zLf3TgpkocQJ:byronboxx.github.com/82.html

† that is a child porn-associated acronym. Use common sense deciding how or if you are going to get yourself on the record searching for that.

edit: made the link unclickable due to reasonable concerns expressed below.