The links on the PdF might not work, because they seem to skip a dash in the url. Here they are again:
“The Facebook Resisters” (Dec 13, 2011)
http://www.nytimes.com/2011/12/14/technology/shunning-facebook-and-living-to-tell-about-it.html
Letters to the Editor
http://www.nytimes.com/2011/12/16/opinion/like-facebook-count-them-out.html?scp=1&sq=like%20facebook
http://www.nytimes.com/2011/12/29/opinion/truth-and-facebook.html?_r=1&scp=1&sq=facebook&st=Search