This is the response from Facebook’s Brandee Barker who commented on the TechCrunch coverage:
Some of Facebook’s source code was exposed to a small number of users due to a bug on a single server that was misconfigured and then fixed immediately. It was not a security breach and did not compromise user data in any way. The reprinting of this code violates several laws and we ask that people not distribute it further.
One has to think the the bad press Facebook has received over the last couple of weeks has really dented their potential value.
Link to Facebook Secrets where the code is posted.