Mohamed Shehab Gorrell P. Cheek Hakim Touati Anna Cinzia Squicciarini Pau-Chen Cheng User Centric Policy Management in Online Social Networks. 9-13 2010 POLICY http://doi.ieeecomputersociety.org/10.1109/POLICY.2010.10 conf/policy/2010 db/conf/policy/policy2010.html#ShehabCTSC10