Do your friends really need this kind of spam?
Now, if the app sent private messages or wrote to the wall of a friend, that could be classified as "spam".
It's unsolicited, bulk, messaging and so it meets definition for spam.
I wonder if it meets Facebook's rules for acceptable wall posts or not. I can see some people hating it.
All kidding aside I would hope that it wouldn't be interpreted as spam. It's a novel way to help someone get up in the mornings, and I would like to assume friends would find it humorous.