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The online information retrieval process enables users to assign keywords for easy access of documents. These keywords popularly known as social tags have now become a popular trend in the information organization. Many online library catalogues has provided provision which allows users to add tags to documents. These social tags has many similarities and variations with the controlled vocabularies used in libraries. Moreover the usage of social tags varies in each subject. The present study tries to compare the social tags and controlled vocabularies in literature and chemistry. The analysis have proved that social tags that exactly match with the subject headings are very high in chemistry and very poor in literature . The study has also proved that the total number of social tags are high in literature and less in chemistry and the social tags are more suitable in fiction than nonfiction.