How to remove your FavStar account
The access is granted using your Twitter account. See below for revoking access from Twitter.
More info can be found in their FAQ:
I’d like to opt out and not have my tweets shown on Favstar or on Favit. If your account is active and unprotected on Twitter, then write @FavstarHelp a tweet asking to opt out. This shows that its your account and prevents others from opting you out without your consent.
If your account is protected, or has been deactivated, please send us an email to optout@favstar.fm including your username and a link to your page on Favstar, and well organize to have you removed. Please do not send us a tweet if your account is protected, as we will not be able to see it.
Helpful Trick: Removing online data
Publicly visible text/images often aren’t properly removed even when you succeed in removing an account. Try editing or removing them manually before removing the account itself. If you’re unsure what happens to your tracks: this can be found mostly in the Terms of Service/Privacy Policy; otherwise you can always contact FavStar and ask personally. By the way, removal requests don’t necessarily mean your data will actually be removed (e.g. due to legal obligations).
Helpful Trick: Remove third-party logins
If you signed up for FavStar using a third-party login such as Facebook or Twitter, you probably want to revoke all access from FavStar. Click here to find out how.