I agree, but I so feel like this comment is suggesting that Facebook isn't using most of these. To me, they all seem to be clear areas of interest or even correspond to features and ad placement that I've observed. Guessing whether people are single, for instance - we'd be naive to not know that FB does that.

Also worth noting that even if they don't themselves derive certain conclusions from our data or use that conclusion, it doesn't mean another party does not. For instance, a user's sleep/wake cycle could be determined by others from the data FB collects and shares with them.