Emil Protalinski, «Instagram Says Thanksgiving 2013 Was Its Busiest Day So Far, but Fails to Share Exact Figures,» Next Web, November 29, 2013.
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Ingrid Lunden, «73 % of U. S. Adults Use Social Networks, Pinterest Passes Twitter in Popularity, Facebook Stays on Top,» TechCrunch, December 31, 2013.
