The internet is very anonymous but that is the whole beauty of it. You can say things or express ideas that you would never do in public or in person. Yup, it can get ugly but you need to learn to take the good with the bad. Remember, out of everything bad, some good will arise but it might be up to you to find it. Keep the faith and believe the lies!
I'm not sure that it's healthy for people to vent freely under the guise of "anonymity." That indicates to me they have undesirable, repressed personality traits or feelings that are unacceptable in "normal" social situations.
I've never found a need to be anything other than I am or to express myself any differently here than I would to someone sitting in the same room with me.
As far as the personal battles go- we have a saying in the fire services "Be a big boy and don't get poopy pants about it."