What is "ffffound!"

FFFFOUND! is a social bookmarking web site that allows registered users to share already existing images on the Internet and to receive personalized recommendations of other images. Users not registered may view these posts and the corresponding recommendations; registration is strictly by invitation. The site was established in 2007 by Yosuke Abe and Keita Kitamura of the Japanese company Tha, owned by Yugo Nakamura.