I have never used Facebook for anything except keeping in contact with friends and family. And since seeing this post and one by @robpyne here, I have taken a careful look at my newsfeed. It seems unchanged.

I wonder why? Maybe it is because I have not shared anything about cryptocurrency or from #Steemit on it? Or is it because I am far away in Africa and not the target of the companies you mention?

I'll keep an eye on things anyway.