الفهرس 
Check-ins” approach in location-based social networks
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Abstract
Location-based social networks (LBSNs) have increased rapidly over the past years due to the continuous use of mobile devices. As people continue to use their phones everywhere and all the time - even while they are eating - a lot of LBSN services such as Foursquare, Facebook place have been introduced. These LBSNs provide new types of services that are location based for social network users. LBSNs integrate the functionalities of both location services and social networks. Consequently, this empowers people to use location data with online social networks in several ways including: location recommendation, mobile-advertising, etc. Mainly, LBSN is used in sharing location between users. In addition, LBSNs make use of the notion of 2check-in3 to enable users to share their location with their friends. To attract more users, LBSN service providers provide offers and rewards to users who check in at a certain place, however, this led some users (i.e. attackers) to cheat regarding their true locations in order to get rewards. On the other hand, fake check-ins can cause losses to service providers. This loss may include money and reputation