I've just a fixed a bug which was preventing a number of users from getting Twitter (Twitwire) alerts for flagged IP numbers. The system was not marking you as followers and, for that reason, you weren't being sent Twitter DMs when flagged IP addresses hit your site. This error has now been fixed. All Twitwire users who are following @wundercounter have now been updated with the correct information.
So, you should start getting tweets now when IPs of interest hit your pages. Thanks to Keith for pointing this out to me.
If you'd like to set up Twitter alerts, choose the Twitter menu item from the Options menu in your account.