Living Reference Work Entry

Encyclopedia of Database Systems

pp 1-4

Date: Latest Version

Geo-social Networks

  • Nikos ArmenatzoglouAffiliated withDepartment of Computer Science and Engineering, Hong Kong University of Science and Technology Email author 
  • , Dimitris PapadiasAffiliated withDepartment of Computer Science and Engineering, Hong Kong University of Science and Technology

Synonyms

Location-based social networks

Definition

A geo-social network (GeoSN) is an online social network augmented by geographical information. Using a GeoSN application, usually through mobile devices, users can check in at places, find friends in the vicinity, etc. A GeoSN can be either a traditional online social network (e.g., Facebook (http://​www.​facebook.​com), Twitter (http://​www.​twitter.​com), and Google+ (https://​plus.​google.​com)) that has been enhanced with check-in functionality or a pure GeoSN (e.g., Foursquare (http://​www.​foursquare.​com)) focused on location-based services.

A GeoSN can be modeled as a social graph G = (V, E) where (i) a node vV represents a user, (ii) each edge (u, v) ∈ E indicates the friendship between two users v and uV, and (iii) each node is associated with a list of coordinates of the locations visited by the corresponding user. Similar to online social networks, the social graph can be either directed or undirected, while the edges can be either ...

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