I think you underestimate the prevalence of the like button. Facebook runs code in your browser on lot of other web pages out there. Probably second only to Google.

Yes. I agree. That said I can't remember the last time I liked something outside FB.

Liking a comment has to be tough to surmise "intent."

p.s. fwiw I'm getting to the point where I'm going to like and follow things just to leave a false trail. Can't hurt.

The fact that typically my FB feed is so shite only tells me they have a long way to go before they analyze the signals I provide them.

You don't have to explicitly like anything for FB to track your usage on practically every website that has a Facebook button. The fact that the site displays the like button in your browser is enough to give Facebook whatever info Facebook wants about your activity on the site.

Ok. Fair enough.

But there are borwser extensions to block that, yes?

Note: That's not a tit for tat counter attack but a question. Tia