Here's a warning to you all. If you get a tweet that invites you to visit a website to find out who is stalking you on Twitter DO NOT DO SO. This site asks for access to yout Twitter account. Then uses it to spam your followers. I know, since I had the spam, that several of our members have already been caught.
If you have inadvertently done this, the way to stop it is to change your Twitter password.
(This post was moved from the Hayley Westenra Twitter thread by Martin).