How to remove your Groupon account
Unfortunately we could not find an automated way for cancelling your account. You’d better send them a mail to ask for removal (use the link). This goes for all Groupon sites (e.g. groupon.de, groupon.nl, etc.).
This is stated in their Privacy Statement (nr 5). http://www.groupon.com/privacy
Nr 3 in the Statement is about sharing your personal data (which in some cases they will share for commercial purposes), so read well.
Direct removal link: http://www.groupon.com/contact-us
Helpful Trick: Removing online data
Helpful Trick: Remove third-party logins
If you signed up for Groupon using a third-party login such as Facebook or Twitter, you probably want to revoke all access from Groupon. Click here to find out how.