ReadWriteWeb reports on privacy concerns as a top trend of 2011 so far. The report looks at privacy-focused social networks and examines concerns about smartphones and a do-not-track mechanism. The report predicts that, in response to Google's social network that allows users to publish information to targeted "circles," Facebook will likely enable selective sharing by the year's end. The report also notes researchers' revelation that smartphones are capable of storing user location data, noting a survey by TRUSTe indicating that 77 percent of respondents don't want their location data shared. 
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