Once a day when someone logs into FB, they should be presented with a word problem asking if the data they have thus far submitted to Facebook can be used to mine such-and-such fact about them.

If they cannot answer correctly, FB should not do said type of mining. As their understanding of the potential for mining info increases, FB is also allowed to add that type of mining.

This would be a win-win. People would actually understand what is going on, and FB itself has something to fall back on when the day comes when people turn this into an inquest (more a question of when than if in my view).

And I wish all the big tech companies would do something like that.