In days gone by a troll was some kind of monster who threatened people and communities.
Trolls are considered to be supernatural creatures in Scandinavian folklore and Norse mythology. They are depicted as dangerous, cunning, and capable of magically cursing people and also eating them up when it suited them. They are considered to be more reasonable than ogres and could be reasoned with unlike ogres. It is believed that they would turn to stone in the sunlight, so they lived in dark caves in isolation in mountains in small family-like units. They are depicted to be living far away from any human population. Their appearance is more varied than ogres. Trolls could either be very ugly creatures and slow witted or could look like humans and could be very cunning and intelligent.
Do not mix trolls with ogres. Ogres were considered unreasonable and murderous; trolls could be reasoned with and may or may not feed on humans.
Shrek, the cartoon character, was an ogre. Obviously he was the reasonable exception. Donald Trump should be viewed as an unreasonable ogre.
Today in Internet slang, a troll is a person who sows discord on the Internet by starting arguments or upsetting people, by posting inflammatory, extraneous, or off-topic messages in an online community (such as a newsgroup, forum, chat room, or blog) with the deliberate intent of provoking readers into an emotional response or of otherwise disrupting normal on-topic discussion.
Facebook is filled with trolls and significant trolling.
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