No they don't.

The toxic communities that exist have a mixture of no-clue 11 year olds with minimal parental supervision (or parental supervision that's failing) through to young adults who found a community that can reflect their feelings back.

Eg: the proana/edtwt communities are clearly children just working things out to young adults getting followings and interaction with a community. It sickens me to see a post from a 23 yr old spouting how to hide ED from your parents by doing the following... Or using subliminals to change the shape of your nose.