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How so? It doesn't provide a tracking mechanism, all it would do is track data running through Facebook - and if Facebook did get to integration level tech, it would be decentralised to gain support of the community.

facebook could allow you to connect a litecoin wallet to your messenger app... then they would have perfect records of all the litecoin sent amongst users...

Firstly, I can't imagine ltc agreeing to this. Secondly, third party pairing via a messenger API would not give Facebook these records. If all they wanted was transactions, they could simply download the public blockchain - all transactions are public anyway. Facebook also couldn't do this due to the aforementioned regulatory issues - hope this clears things up for you :)

Sounds like you know better than I