Question: Which permanent account has registration of Invite-only and userpics free of Unknown?
SQL: SELECT "Permanent Account" FROM "2-16533529-2" WHERE "Userpics Free" = 'Unknown' AND "Registration" = 'Invite-only';

Question: What is the year began for the site with free userpics cost of $1 and a userpics paid value of N/A?
SQL: SELECT "Year Began" FROM "2-16533529-2" WHERE "Userpics Paid" = 'N/A' AND "Userpics Free" = '1';