Thanks to all of you for such thoughtful and constructive comments on our initial post about unlocking expired stickers. As some of you noted, we had in fact been experiencing inefficiencies because of people who were gaming the system. This is the reason why many of you were not receiving the stickers you earned via inviting friends to sign up.
We appreciate and value your suggestions and, with your support, we will get this right. Thanks for your patience as we reimagine this feature.
Stay tuned, we will announce more here soon!