Keyphrases
- topic hierarchy
- social annotations
- collaborative tagging
- social tagging systems
- tag recommendation
- automatically created
- tagging systems
- topic hierarchies
- social tagging
- collaborative tagging systems
- web resources
- learning resources
- personalized search
- user generated
- automatically generated
- artificial intelligence
- web search
- web documents
- document similarity
- metadata
- smoothing methods
- social media
- rfid tags
- combining multiple
- social networks
- text data