On fav20, I have added a new feature that lets you set public or private the newly added websites (this feature is available only for logged in users).
This won’t change privacy of current saved websites. To share the already saved websites you have to click on 
Hint! To share your public profile you can use the link http://www.fav20.com/user/[your-username] (Ex: http://www.fav20.com/user/demo )