Recently, the fields of information retrieval and social network analysis have contributed to the emergence of a new category of information retrieval systems, namely the SIR systems (Social Information Retrieval). These systems extend conventional IR to incorporate the social context of search and recommendation. A particular aspect of SIR is the modeling of the social interaction between people (social ties), which is used for enhancing recommendation systems. Our goal in this topic is to see how information retrieval systems can be enriched by analyzing these social ties, and particularly the strong and weak ties that measure the strength of relationship between people.
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