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 [email protected] 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.
URLS:
http://favstar.fm/
Please note that AccountKiller.com is not associated with the business listed on this page. AccountKiller provides easy-to-understand instructions and guides on how to cancel charges and relationships from the list of businesses on our site, we have no affiliation with these businesses.
Their instructions for deleting an account are listed at the bottom of their FAQ page here: http://favstar.fm/help/faq
Actually, it looks like they changed their opt out process recently, now people with active accounts can log in and remove themselves: http://favstar.fm/help/opt_out
Please delete my account deactivated it please
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