They grow cultures in Gerüchteküchen. Their ear loves listening to spicy stories and drama. They digest it by filtering all the compromises and nice parts out of a story and then fart an ugly, stinking rumor into the world. Where Gerüchteküchen simply lead to watered down stories, these monsters feed on the nice and actively turn them into vile bile.
How to fight it
Mind your own business - do not interfere with personal relations of others, since you will never ever be able to see the whole picture. They love misinformation and turn the participants of a story into enemies and feast on the resulting drama. Don't feed them!gab