Require an account for non-subscribers

Require an account for non-subscribers

Another option would be to require that non-subscribers create an account before they're allowed to post comments. Account properties would include an e-mail address and a comment posting flag. New accounts would require a reply to a validation e-mail before being fully activated. If the account ends up being used for trolling or spamming, then turn off the comment posting flag to block comments from being submitted. If the troll tries to set up another account using an e-mail address that matches an existing account with the comment posting flag turned off, then either turn off the posting flag on the new account as well or just block it from being created in the first place.

While this would not prevent a troll from using a different e-mail address to set up a new account to troll from, hopefully the hassle of going through all these steps would at least discourage such activity.