Retrieval to specific information is critical to user satisfaction in today’s semantic web environment. Users use various terms, nomenclatures and words for aiding mnemonic value to identify concepts for future access and sharing with community members. Social tagging has emerged as a popular option for the millennials to address this issue Tagging is a convenient way used by today’s users for naming their web resources in their own terms. In this study a comparative study was carried out between the standardised Online Computer Library Centre (OCLC) Faceted Application of Subject Terminology (FAST) Subject headings and the popular user-generated tags observed on the LibraryThing website for select books written by Mahatma Gandhi, the iconic Father of Modern India, who was also a prolific writer. M K Gandhi wrote many books, letters, newsletters, essays and edited journals on various subjects like health, vegetarianism, diet, religion and social reforms. A close examination of the subject headings and tags given by users to works authored by M K Gandhi reveal that there is a vast amount of difference between the standard terms assigned using OCLC FAST Subject Headings and tags assigned by the users. The study reveals that neither subject headings nor tags are perfect systems by themselves, but they may complement each other in library catalogues. The inclusion of user-generated keywords into catalogues will greatly enhance representation, organisation and retrieval of resources in a library environment.