Fridge Magnets
Every website has a guest book. Mine has a fridge with magnets on.
It's a shared magnet wall where visitors drag words around to write messages, poems, or whatever comes to mind. You could completely roast me. Everyone sees the same fridge; if someone on the other side of the world moves a word, it moves for you too.
The idea for this came from a random memory of playing with fridge magnets when I was a child. It was fun to leave small messages for family and you had to be creative due to the handful of available words. The constraints are part of the fun.
Personally I will mostly use it to write little haikus when I get the feeling, but it's then fun to see if someone else has left me a message; maybe you will too?
The fridge resets every Monday. A fresh week, a fresh slate.