The new farmville co-op system allows formers to work together with their neighbors. It is all about completing tasks as quickly as possible. First the folks in farmville will ask for help in completing farming jobs. You can post a message on your wall to recruit neighbors to help get the job done. You need to grow enough crops before the time expires. The faster you finish, the bigger your ultimate reward.
For a complete guide to farmville co-op jobs please visit the Farmville Ideas web site
The Co-Op function will also include its own set of Ribbon rewards to earn. Additionally you will be able to earn Gold, Silver, or Bronze statuses.