If your strategy is to give private data to an ad company and then expect who you do or do not friend to be the perimeter that controls its distribution, you have already lost.
The best thing you can do is to delete your profiles on these services.
>>pbhjpb+87
The problem is that when you are on it, you contribute to the network effect and make it more useful to others to submit themselves to surveillance in turn. You and your interactions with your friends becomes the honey in the trap.
>>pbhjpb+87
The baby has already died and the bathwater is diseased and festering. Give it a proper funeral if you like, but it needs to be buried deep in the ground where it cannot spread any more disease.