Many websites have had serious security issues that make this follow bug look trivial in comparison, but they haven't felt any effect from it. For instance MySp

Many websites have had serious security issues that make this follow bug look trivial in comparison, but they haven't felt any effect from it. For instance MySpace had a XSS vulnerability that added the XSS's creator to everyone's friend list. Facebook has its share of viruses that spread themselves by getting the user to click a link which then causes the virus to send itself to all their friends or write on their friend's walls. None of these problems have seriously effected the sites usage and it won't effect Twitter's either.