How to Report Child Porn on FB?

Hey, sorry to ask this here but I figure there are many FB employees on HN. FB just showed me a disturbing video thumbnail in the "Trending Videos" section. It looks like some bad child porn, but I didn't click to view it.

FB's report abuse section just says to report content using the dropdown, but it doesn't exist for Trending Videos.

Here is a screen shot of my wall or whatever it's called:

http://dl.dropbox.com/u/396448/Screen%20Shot%202012-06-24%20at%2010.56.03%20PM.png