I don’t use FB for much but groups but I am in a few local ones that I have found useful for information and buying/selling. In the last few weeks though they all seem to have been infiltrated by endless US spam about ‘this dog was found in LOCATION - please share’ or ‘this 14 year old from LOCATION is missing and her parents are out of their minds’ etc. Accompanied by photos that are very much not of my local area. The more convincing ones get people sharing and commenting on them. It’s basically killed any algorithm that ever showed me useful things. Helpful maybe in being the thing that finally makes me leave FB properly but it’s a shame to lose the good bits of those groups.