Nice idea, but i guess that maybe the message might be a little too generic. Why not have a random message appearing every day to make it a little more fun for all your friends?

E.g.

* "Your friend John has probably been reading Hacker News all night and didn't get up on time this morning"

* "Once again, your friend Suzanne could not get herself to hit the snooze button this morning. Please post stupid comments on this post."

* "Bob is in dreamland right now instead of on his work. Please call his boss and tell him."

;)