All staff and participants will wear devices that send an alert when too close to others.
The game relied on Flash, which will no longer be supported by Facebook after December.
We look at why you can't log out of a venue, and how to change your postcode on the app.
Users in England who booked a test outside of the app can only register a positive result.
The pop star says he deleted his account after "hateful videos" affected his mental health.