1. A system to enable a mobile device to use physical storage of another device for social caching, the system, comprising: a local proxy on the mobile device which receives a response in response to a request to a content source; wherein, the local proxy wirelessly accesses the physical storage of another device via a wireless network to cache the response for the mobile device; responsive to subsequent requests at the mobile device which would be satisfied by the response, the physical storage of the other device is further accessed via the wireless network to satisfy the request at the mobile device; wherein, the physical storage of the other device is accessed in response to detecting commonalities between the mobile device and the other device; wherein, the commonalities include, a user of the mobile device and the other device having same or similar friends in an online network or social network.