You know, I think there's a number of separate issues in general. Assume the tracking and collecting of personal data from other sites is fine, that there's not

You know, I think there's a number of separate issues in general. Assume the tracking and collecting of personal data from other sites is fine, that there's nothing wrong with it. They could still a) not try to buy up all their competition and b) not pollute the feed with things people don't want to see. Why should clicking 'interested' in an event broadcast it to all my friends? Why do I get pages in my feed my friends commented on? One action in particular may not tell you anything about the company but when you keep getting predatory behavior it maybe says something about how the company (or 'engagement engineers' or whatever) views the public