will repeat these suggestions wrote:
Two suggestions.
1. Ban posting from common VPNs, since this is used to get around bans.
2. Ban registering emails with a '+' sign, as this is used by trolls to circumvent the one-account-per-email, and require the email to be confirmed before the account is valid.
We could consider the VPN thing. Would be interesting to see what percent of legit posters use a VPN vs what % are just trolls. But people use VPNs for legitimate reasons.