The EULA [ http://www.tweak.com/eula.htm – combination of PP/ToS] does not hand us clear information about account deletion, neither did the FAQ or Settings menu. The only thing stated in the EULA is that you may request to “delete your details from any marketing lists held by us”.
So our advice is the usual one: try contacting them and request deletion. [ http://www.tweak.com/feedback.htm or [email protected] ] Otherwise you may try some anonymisation.
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.