To clarify, you can use mappiness outside the UK, and you will be beeped and get access to the feedback charts...
...but you do have to manually convert the times you don't want to be beeped to the UK time zone, and we don't guarantee to use your data in our research.
In retrospect I regret that we didn't launch with explicit support for the US/Canada at least -- but we do plan to add more countries in future.
From the last link I liked the idea, installed the app and mapped my happiness a few times, only to find out it was UK only :(