Patent Document ID: 7680891
Application ID: 11425118

Base Claim:
1. A computer-implemented method of controlling spam, comprising: on a server system having one or more processors that execute programs stored in memory of the server system: determining, for a set of documents created by a creator, a metric whose value indicates an extent to which the set of documents includes spam, wherein the value is on a predefined scale and wherein determining the metric for the set of documents comprises determining at least one spam score for the set of documents; determining a challenge rate associated with the creator based on the determined metric whose value indicates the extent to which the set of documents includes spam, wherein the challenge rate is less than one hundred percent and wherein determining the challenge rate comprises determining the challenge rate associated with the creator based on the at least one spam score; and presenting to the creator a challenge in accordance with the challenge rate whenever the creator attempts to create a document.

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Claim 5:
5. The method of claim 1 , further comprising: receiving a response of the creator to the challenge; and adjusting the challenge rate based on the response.