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Viral advertising in social media: participation in, Viral advertising in social media: participation in facebook groups and responses among college-aged users shu-chuan chu depaul university. this study examines the. Most popular websites, facebook, twitter, youtube, Most popular websites, facebook, twitter, youtube, craigslist, linkedin, foursquare, google, yahoo, bing, cnn, fox news, videos, photos, movies, images, pictures, blogs.. Footnotes & sources - social networking pros and cons, The background and pro and con arguments were written by procon.org staff based upon input from the following footnotes (directly referenced) and sources (used for.