This blackboard pendant necklace is an awesome idea.
I would use it like real-life Twitter, and update my status on it
throughout the day: "The lady beside me is wearing a hideous jumper."
"Lady in the hideous jumper just read my necklace and she looks grumpy."
"Running away from angry lady in hideous jumper."
The blackboard pendant necklace is NZ$35.00 from Artisan Jouel on felt.co.nz.