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In 2018, on March 17 the so called "#CambridgeAnalytica Files" were published by the Observer (Guardian Media Group, https://web.archive.org/web/20180318014456/https://www.theguardian.com/news/series/cambridge-analytica-files).
The journalistic investigation by Carole Cadwalladr and Emma Graham-Harrison [1] discussed one of the first examples of digital social engineering in the context of potentially subverting democratic processes via #SocialMedia and #MachineLearning techniques with custom #manipulation of each accessible individual elector.
Overview in the video [2].