Good tip. I checked it but "close friends" is empty.

But you may be right. Even though i don't interact on Facebook; i only check what videos/pics/news they shared and click the ones that i am interested in. (not even 'like' them)

But as you said, Facebook is probably tracking my 'clicked news/pics' and show those friends' activities.

I will monitor it for some time.

Thank you all for the tips. Have a great weekend.