See this project: “Botanicalls Twitter answers the question: What’s up with your plant? It offers a connection to your leafy pal via online Twitter status updates that reach you anywhere in the world. When your plant needs water, it will post to let you know, and send its thanks when you show it love.”
It remininds me of creating a new reputation system in which the reputaion is created not by the user but by the objects… In “Botanicalls Twitter” the plants are giving positive feedback if you care for them.