Few days ago I allowed anonymous people to vote on the forum. The result was discovering a bug about sending email notifications to subscribers of certain posts for every vote as well as receiving a lot more votes than usual, both positive and negative ones.
Now that this bug is discovered, but a solution is not yet found I've reverted back to where we previously were, just registered users can vote. This means less votes and less notifications, but it also means one other thing which is pretty much the biggest purpose of this topic - it appears that many votes might have been of malicious nature. I've seen some entries, like this and