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This work addresses the topic-based community key-members extraction problem, for which our method combines both text mining and social network analysis techniques. This is achieved by first applying latent Dirichlet allocation to build two topic-based social networks in online forums: one social network oriented towards the thread creator point-of-view, and the other is oriented towards the repliers of the overall forum. Then, by using different network analysis measures, topic-based key members are evaluated using as benchmark a social network built a plain representation of the network of posts. Experiments were successfully performed using an English language based forum available in the Dark Web portal.<\/jats:p>","DOI":"10.1145\/1964897.1964917","type":"journal-article","created":{"date-parts":[[2011,4,1]],"date-time":"2011-04-01T11:54:25Z","timestamp":1301658865000},"page":"66-73","update-policy":"https:\/\/doi.org\/10.1145\/crossmark-policy","source":"Crossref","is-referenced-by-count":44,"title":["Topic-based social network analysis for virtual communities of interests in the dark web"],"prefix":"10.1145","volume":"12","author":[{"given":"Gaston","family":"L'Huillier","sequence":"first","affiliation":[{"name":"University of Chile, Santiago, Chile"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hector","family":"Alvarez","sequence":"additional","affiliation":[{"name":"University of Chile, Santiago, Chile"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sebasti\u00e1n A.","family":"R\u00edos","sequence":"additional","affiliation":[{"name":"University of Chile, Santiago, Chile"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Felipe","family":"Aguilera","sequence":"additional","affiliation":[{"name":"University of Chile, Santiago, Chile"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"320","published-online":{"date-parts":[[2011,3,31]]},"reference":[{"key":"e_1_2_1_1_1","doi-asserted-by":"publisher","DOI":"10.1109\/MIS.2005.81"},{"key":"e_1_2_1_2_1","doi-asserted-by":"publisher","DOI":"10.1145\/1361684.1361685"},{"key":"e_1_2_1_3_1","volume-title":"Latent dirichlet allocation. 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