Twitter spammers have been put on notice. Starting today, each profile on Twitter now includes a “report [username] for spam” link. When clicked, the feature alerts you that it will immediately block the user and report them to Twitter for review.
To-date, Twitter has been using the @spam account to allow users to quickly report spam messages via direct message. The “report spam” link should make this process a bit easier and more readily apparent for users of the Web interface.