A troll is someone who posts inflammatory or off-topic messages on social media. These trolls take advantage of the social media freedom they have to do whatever they like which is usually in bad taste.
They are attention seekers and if you are not careful, they will get under your skin. In order to help you identify these trolls, see some of the types of trolls you may encounter online. The best way to deal with them is to ignore them.
The grammar police troll
They are simply looking for mistakes to correct. They do not care if you knowingly or unknowingly made the mistake. They just want to call you out on your poor grammar. The best response? Correct the mistake and say thank you!