What information is collected about accounts on your servers?

What information is collected about accounts on your servers, and how long is it stored after accounts have been purged or deleted?

We do not collect information about our users. The only information we have is the one that users provide themselves in their profiles. Every user can change/delete this information at any time.

Unused accounts are not purged. The user can get back and use his/her account at any time later. The user has full control and can remove all personal data from his/her account at any time and this way leaving the unused account empty.