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Chapter 26: Understanding Online Communi... > ONTOLOGIES FOR THE SOCIAL WEB: STATE... - Pg. 438

Understanding Online Communities by Using Semantic Web Technologies ONTOLOGIES FOR THE SOCIAL WEB: STATE OF THE ART Social Networking In order to represent social networking informa- tion using Semantic Web technologies, FOAF ­ Friend Of A Friend (Brickley and Miller, 2004) ­ http://foaf-project.org ­ is probably the most well-known ontology. It provides a model to represent people (with a foaf:Person) class, their properties and attributes (ranging from foaf:name to foaf:schoolHomepage) as well as a foaf:knows relationship which is used to represent social networking aspects. This last relationship is semantically weak, and to overcome this lack of precise semantics, the RELATIONSHIP vo- cabulary - http://vocab.org/relationship/ - provides a set of subproperties such as rel:colleagueOf or rel:lifePartnerOf to describe more precise platform way to define social networks, one key factor of FOAF and of Semantic Web technologies themselves. That is, we enrich the network value of a graph by linking information together at Web scale (Hendler and Golbeck, 2008) (Passant et al., 2009a). Merged together, different FOAF profiles can then be combined for an integrated view of one's social network, using profiles from different people and even different applications, as shown in the following picture. Here, we can see that three social networks have been defined on three different platforms, but are generally interlinked thanks to the use of common URIs to identify the people belonging to these social networks. Practically, this means that three dif- ferent services, e.g. a weblog using WordPress, a Content Management System based on Drupal and a wiki using MediaWiki can unify their social networks, while being managed by three distinct applications that natively store their information