| 摘要 |
<p>Methods, systems, and apparatus include computer programs encoded on a computer-readable storage medium, including a method for providing content. The method includes marking a particular user is a spammer, receiving a request for content from the user, providing a first type of content item that tests whether the user is a likely spammer, and when the user interacts with the first type of content item, marking the user as a likely spammer. The method further includes receiving a subsequent request for content, providing the user with a second different type of content item, and when the user interacts with the second different type of content item, marking the user as a spammer. The method further includes determining a false positive ratio of the spam detector based on a number of times users are marked as potential spammers versus the number of times that users are ultimately marked as spammers.</p> |
