Yeah all my actual friends are messaging me elsewhere, facebook is more like a picture dump for old people. I only use it occasionally for joining various expat groups since I move countries frequently for my job, and they are rather resourceful.
It sure might be, but the one friend who got blocked is just casually posting stuff from his personal life, nothing spammy going on there. Either facebook is screwing with me, or they are playing out some friend's posts in the ad-network stream so you are actually losing some genuine content. That would be evil (and totally something Meta would do), but I really couldn't care less.
I do think that sounds more like they're hiding it and blaming adblock than pretending something was missed. Wouldn't be surprised if it starts small and ramps up over time, but that's just speculation.