The SpamFilter interface, which was a part of User-Generated Content in SDL Tridion 2011 SP1, has been deprecated in favor of the Validator interface.
SpamFilter
Validator
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Deprecation of ASP API and ASP.NET API used in 5.3 SP1 and earlier
Deprecation of Search Filter API
Deprecated functionality in Content Delivery
UGC validators
Web Client changes
Creating a custom content validator