The "recents" is just the term used for the "recent" tab in the community. Once a user posts a skin, it goes into the recents. Users have posted hundreds of skins at a time to spam the recents, as well as use the recents to advertise their skins, profiles, contests, and hashtags. Most community activity takes place here.
fun fact: The recents page contains every skin currently posted on skinseed, of all time, and one could possibly find the first skin ever posted by scrolling for hours, days, or even longer through the recents.