We have had a problem with strange spambots recently, as you might have noticed. While they don't post links, they post random nonsense that doesn't add anything. They have been able to get past our security questions even though they have been changed, so it seems like there might be a person behind them. Whatever it is, the best way to stop new spambots from coming in is to ban IPs.
A person affected the ban will get a message with a way to appeal and contact us if they wish to gain access. We're sorry for the inconvenience, but when spambots wanna spam, everyone loses.