Report them to the police
Tell them to Stop! or ignore them!
Hit them in the head with something and run.
You could tell them to stop. Or you could report it to Twitter
I'm not sure about that, but it is stalking, so you should probably stop.
He will stop following you once you escape from Helgen Keep.
You can block Aaron Carter on Twitter to stop him from following you.
Synonyms for following (someone) include trailing and stalking.
"Why did you stop following me" is in Dutch "Waarom ben je gestopt met mij te volgen?"
You can block them - you won't see any of your tweets when you do.
Someone's following me or someone's after me
You do exactly as you would do if anyone else was following you, you tell them firmly to stop and if they don't you take it further such as by contacting the police. Just because a person is Autistic doesn't make it okay for them to be following you or mean you have to act differently.
She never stops following you.