[BikerJoe]

As others have said, a high level review that may, if they're lucky, find smoking guns is possible. Also depends on how well documented things are. An exhaustive in-depth review, no way, regardless of how good the reviewers are.

If they're looking for where all the trouble-causing stuff is, like the ability to de-emphasize or outright censor certain people, or just focusing on finding the algorithms that enforce their "community standard" rule BS, then those might not be too hard to find and analyze.

[curious7]

Or they kept that separate and off-site; say at a three-letter agency location.