Always thought it was easy enough, sometimes wondered at previous on here, if you're up to no good don't put it on the f***ing internet.
As for faceache, I signed up to promote something, Twitter worked better. Don't care who looks at it, another easy rule don't put anything out there you wouldn't want on the front of a newspaper.
Some people are easily swayed, like the Cambridge Analytics stuff, games on faceache what's your fave colour? Then we'll match your age with your fave colour and target whichever advert at you. People are idiots.