Social media platforms leave 95% of reported fake accounts up, study finds

Found on Ars Technica on Saturday, 07 December 2019
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About a month after buying all that engagement, the research team looked at the status of all those fake accounts and found that about 80 percent were still active. So they reported a sample selection of those accounts to the platforms as fraudulent. Then came the most damning statistic: three weeks after being reported as fake, 95 percent of the fake accounts were still active.

Why should they remove them? It only reduces the number of total accounts they can go advertising with.