Keyphrases
- information retrieval
- social networks
- social media
- social networking
- social interaction
- document retrieval
- text mining
- query expansion
- document collections
- test collection
- question answering
- information retrieval systems
- information extraction
- search engine
- retrieval systems
- knowledge sharing
- language modeling
- vector space model
- tf idf
- social web
- data sets
- similarity measure
- information access
- social relationships
- social bookmarking