You will need to develop simple Gifts Application. Users on Facebook will have ability to send Fruit or Vegetable gift to their friends. There should be two categories: Fruit and Vegetable. For example if user click on Fruit from the categorise then it will show a few list of Fruit such as Orange, Strawberry and Grapes.
When they select a fruit then it will ask which user to send and write a personal message (A message that when a user receives it, it will be shown in "received gifts" on their profile and a picture of gift). If user sent 5 gifts to their friends (and been accepted) then they will get a discount code to buy gift from other website. We also need a feature that they can hugs gift and maybe points.