The only personal information that we require is name and email address. You can also enter a business name, phone number, website, and numerous other items, but you're not required to.
We have to have a name and email so that the system can contact you if there's a problem. We ask that you always keep an active valid email address in your profile, even if you're just trying us out or looking around.
We never sell or share our user data with anyone. Read more about that in our extensive Privacy & Security area.