Question Author
@Naomi - I think you are probably right.Its not even a guarantee of more civilised behaviour, unfortunately.
I just think that all too often people forget just how public internet forums, facebook, twitter etc are - posting or tweeting or commenting is the equivalent of shouting out your thoughts via a megaphone in a public park, and having that shout preserved forever, renewed and re-uttered each time someone, anyone, walks through it.
And as wolf says, mental illness is often hard to understand or appreciate unless you yourself have had personal experience of it.
The casual cruelty of teenagers never fails to amaze me either - vulnerable as they all are to issues surrounding self worth, friendship, a desire to belong. I am just glad I do not have to experience all that again, in this virtual age we now inhabit...
I do feel very sorry for this girl.........