Small tip: shrink the registration-barrier. 1. Add those social login buttons (facebook, twitter) 2. Make "e-mail address" the only input field, then mail me

Small tip: shrink the registration-barrier. 1. Add those social login buttons (facebook, twitter) 2. Make "e-mail address" the only input field, then mail me a password. 3. Delay asking me for a display-name until I try an operation that needs it.