Any chance you could do a Facebook checkout of your data, i.e. download all the data associated to your Facebook account? This option is open to Europeans, I don’t know if North Americans have it too. Last year a Swiss radio journalist did that, and noticed that some information about “facedata” and some thresholds was included. He asked them about it, I don’t know if he ever got a response. The checkout does not seem to include that type of information anymore (at least not for me, but it is worth trying). See here if you read French.