I find it likely that your feelings of anxiety are not well correlated with actual risks in this area.
And I'll add that I believe the purpose of ethics is to improve people's lives .Ethical standards which turn the ordinary facts of living into worry that one is doing the wrong thing are a bad idea.
This article let's me know I'm not the only one concerned at the dominance of companies like Google and Facebook. I don't have enough data or information to judge whether my continued use of these services are going to be detrimental to me or the rest of humanity. What I do know is that increasingly I'm feeling like Facebook and Google know too much about me and have too much of my attention. I feel a little bit like a puppet, a little bit strung along. How do others here feel?
It reminds me or is analogous to this. In my opinion the food industry having a monopoly on what we eat, just as Google and Facebook will have a monopoly web content. Is this a risk on society?