Changes

See<ref>[http://www.pewinternet.org/2014/08/26/social-media-and-the-spiral-of-silence/ Hampton Keith, Lee, R., Weixu, L., Maria, D., Inyoung, S., & Kristen Purcell. (2014). Social Media and the “Spiral of Silence.” Pow Reasearch Center. Retrieved from http://www.pewinternet.org/2014/08/26/social-media-and-the-spiral-of-silence/]</ref><ref>Da-Han Reem and Yaron Tal. (2015) Spiral of Silence in Facebook hate groups (In Hebrew)</ref>