Answer:
The quotations from the excerpt that provide evidence to support the claim that governments have responded to criticism delivered through social media are:
"Security forces arrested three people who administered nearly two dozen F*cebook pages."
"It [Egypt] also detained activists who had been involved in prior protests."
"Meanwhile Turkey has made 805 requests for tweets to be removed since 2012."
Explanation:
These quotations show how the government of this countries disapprove and limits the right of expression on their citizens, applying legal punishment in many of the cases and the immediate end to any kind of organization the people were making, sometimes the countries don't have a real threat in this post besides they are acting in an authoritarian way.