Facebook Transparency Report

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During the first half of 2015, governments requested Facebook account
data more than 41,000 times, according to the company's most recent
transparency report. During that same period in 2014, the figure was
just over 35,000. Nearly half of the requests came from US law
enforcement. Facebook provided requested data on 80 percent of those
cases.
http://www.csmonitor.com/Technology/2015/1112/Governments-around-the-world-demand-more-user-data-from-Facebook