"Enclayve has no access to content or information or data of any kind on your Block and therefore cannot and does not collect any information on you; your Block and all its content is owned solely by you."
In contrast, the Facebook Privacy and Data Policies have far too many pages of legal language to put here! Fortune Magazine (from April 20, 2018) has this synopsis:
"Facebook collects data about everything you share. Facebook's new data policy guide tries to spell out the kind of user information it shares and with whom. Specifically, Facebook collects content users provide from when you sign up, when you upload or share content, and when you communicate with others on Facebook."