US8768302B2
patent
A server system having one or more processors and memory receives, from a client, an invitation-code request from a user of the client for an invitation code enabling a new user account to be registered, where the invitation-code request includes identifying information and determines whether the invitation-code request exceeds registration limit criteria based on the identifying information. In accordance with a determination that the invitation-code request exceeds the registration limit criteria, the invitation-code request is rejected. In accordance with a determination that the invita tion-code request does not exceed the registration limit crite ria, an invitation code is provided to the user, enabling a new user account to be registered.
12 claims. 61,029 characters of text.