Are you a FB developer?
Were you already having problems with your Mac?
Moving along here, why not use your Time Machine backup to put your machine back into the state it was in Before you ran the debugger?
Failing that, if you are a developer, you still have your other machine to work with, the one you do not develop on, while you format and reinstall OS X on the messed up one.
I recently used the FB debugger tool here http://developers.facebook.com/tools/lint/ but have been having tons of computer problems since then. I have a Mac that was then running on OSX 10.8.4. Since I used the debugger a few weeks ago, I've had problems with images not showing correctly on sites (it shows a "?" symbol instead of the image), problems with pages not loading correctly (so for instance the format of a page is messed up and links are not displayed correctly), and things like clicking on a radio button don't always work like they should. I've tried resetting Safari, restarting my computer, resetting permissions, and downloading the latest version of Safari and the problem is still there and seems to get worse every day. I also just downloaded Maverick OS X 10.9.2 and still am having trouble. Does any one have any suggestions?