Keeping autistic teenagers safe online

Whilst there is a danger with all teens, autistic teens seem to be particularly at risk. Some struggle greatly making friends in person and find it easier to chat online and some struggle with social skills. Some may not understand the chats so are more vulnerable than their peers.
A lot of autistic teenagers take things literally and can believe what they are told. This could be very dangerous as a stranger telling a child they are their friend and the same age as them could be taken as fact.