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The ever increasing popularity of social networks and the ever easier photo taking and sharing experience have led to unprecedented concerns on privacy infringement. Inspired by the fact that the Robot Exclusion Protocol, which regulates web crawlers' behavior according a per-site deployed robots.txt, and cooperative practices of major search service providers, have contributed to a healthy web search industry, in this paper, we propose Privacy Expressing and Respecting Protocol (PERP) thatdoi:10.1145/2668332.2668339 dblp:conf/sensys/BoSLLZZ14 fatcat:n4tfwkg42fgxzmp5cskthpkb64