By Chesney Hearst, Senior Contributing Reporter

RIO DE JANEIRO, BRAZIL – The sweeping mass robberies known as "arrastões” (big drags) on Rio de Janeiro's beaches last weekend and their spread into the Zona Sul (South Zone) neighborhoods of Botafogo and Humaitá were quickly followed by reports of a rise of in alleged vigilante attacks and groups promoting vigilantism through social media.

In response, the Delegacia de Repressão a Crimes de Informática (DRCI) (the Police for the Suppression of the Computer Crimes) began analyzing social network messages on Monday, September 21st.

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