A method includes receiving user-created content, as well as at least one of a service identifier (ID) and a content category ID of the user-created content. At least one of a plurality of key information databases is selected based on at least one of the received service ID and the received content category ID. Second key information is extracted from the received user-created content. The selected key information database is searched to retrieve first key information related to the second key information. The user-created content may be classified as spam content based on the extracted second key information and/or the retrieved first key information. The user-created content is conditionally stored in a network accessible data store, available to users of the user-created content hosting site, based upon the classification.