We propose a de-centralized privacy protection without deploying an intermediate server between users and an LBS.

A generic distributed framework based on the structure of Peer-to-Peer systems and the trust relationship retrieved from the social networks to support any underlying privacy protection approach, such as K-anonymizing spatial region for location obfuscation.

We propose SocialHide, which is integrated with the social relationship to determine data access permission among social friends for K-ASR construction.

The proposed protection mechanism is evaluated on both a real-world social network and a synthetic small-world social relationship dataset.

Results show that our proposed model generates a reasonable K-ASR size to avoid center of K-ASR attack.