A friend of mine who was barred (unjustly I might add) said they bar your whole IP Address....., so unless you have another computer in another location and it's connected to another email... it's impossible to multi-account.
The social media companies don't just bar your user-name -- they bar your IP Address and all accounts associated with your IP.
I think they should make it a policy for people to use their real names too, because when they're held responsible for their actions and they're destroying their real identity.... they think twice about being abusive trolls.
so you want to persecute people for their past sins?
there have been plenty of words exchanged and the community has policed itself well enough.
was your suggested idea useful for the community? its just an empty threat that won't be realized unless you enforce it first.