Is there a bot or greasemonkey script that auto-comments on facebook?

Bad etiquette for my first post to be asking for something, so the first person who can give me info on this (if it exists) gets 5000 invites to a fan page/group of their choice once my profile hits max (within the next week).

Is there any bot or script available that will automatically post the same comment in one or more facebook groups every few minutes? Thanks a lot guys.