What are "footprints" and what do they mean?

When a person has viewed your profile, looked at your artwork, etc. their name appears, in order of the most recent visitor, as a footprint on your profile page.

When access to your profile or artwork reaches a certain number of people, for example 1000, 2000, etc. you can receive an update mail from PhotoZou. To receive this update, go to Settings on your Top Page and set the number of people.