For about a year and a half now, imgflip's politics feed has been spammed near daily by one person. We know it's the same person despite the different usernames each time because they're very distinct: memes with racist, Islamaphobic, homophobic, or just generally threatening overtones, and comments that are very poorly spelled (although with very consistent spelling) but very firey rants about how he and the MAGA are going to kill the left wing, send Jews to the ovens, massacre black people, massacre Mexicans, massacre Muslims - the list goes on, and he uses very violent imagery.
It's very clearly against the Terms of Use of imgflip, but there aren't very many mods and he can crank out these alt accounts very quickly, so if you do learn to spot his very distinct memeing style, it can be very helpful to the mods if you can flag them and alert other users that it's him to minimize his opportunities to engage in his kind of awful spam.