If people and pets have social networks, why not leaves?
Leaf++ : A Social Network Based on Leaves (Games Alfresco)
The Leaf++ project was conceived by an artist interested in identifying leaves in the field and to add geo-tagged information about them for other people. A person takes a photo of a leaf with a phone and has it match the pattern to leaves in its database. If has been previously indentified, information about the leaf is presented. If not, the user can add information, including location, about the leaf. This information will be available to the next person who uses the app to identify the leaf.
The app is seen running on an iPhone in the video demonstration embedded below.
Video courtesy of xdxdversusxdxd