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semantic web semantic spreading activation dbpedia exploratory search linked data discovery hub spreading activation sioc foaf search engines social web rdf social object object centered social network gandon ocso ncmarie ribiere semantic social web bell labs ontology inria object centeredsociality ontology ocsn sociality object centered temps present histoire 20 web participatif rww journalisme ihtp ina web social journalism histoire web 20 history histoire immediate human evaluations linked data based exploratory search system multiperspective exploratory search state-of-the-art linked data recommenders semantic browsers survey exploratory search systems knowledge retrieval faceted search human computer interaction facebook graphs open graph protocol multidimensional social networks ocso ontology heterogeneous social networks ogp pervasive communication opo ocsn ecosystem fr