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Google has deleted the Facebook Secrets blog which was the most popular source of the leaked Facebook PHP code. Most likely, Google was sent a DMCA claiming that the code was copyrighted by Facebook, although why it took at least 4 days to get the blog pulled is anyone's guess.
Does Facebook have the right to pull code based on a copyright claim? Who knows, but it was certainly time to act: Facebook Secrets leaked a second piece of code a few days later - the Facebook search source code - and could have had a lot more in its box of tricks.
The question is whether new code will continue to surface in other places. If they have more material, they could just set up a new blog elsewhere and keep on rolling. Keeping data under wraps, it seems, is an impossible task.
And, by the way, the blog is still available via Google's cache: why don't they bother to clear that when they respond to a take down notice?