Exclusive: Facebook said Friday that it will stop showing audience reach estimates in any campaign using Custom Audience targeting. The move comes after a research team from Northeastern University notified the company through Facebook’s Bug Bounty program about a potential privacy vulnerability it identified with Custom Audiences. The research team from Northeastern University and MPI-SWS is the same group that identified another exploit with Custom Audiences leaking user phone numbers in December. In response, Facebook removed reach estimates for campaigns using customer data. It added back in March. “In the meantime, we’ve been looking at other features in the advertising interface and how they might be misused,” Alan Mislove, a professor at Northeastern and faculty advisor on the team, told us by phone Friday afternoon. Exclusive: Facebook will no longer show audience reach estimates for Custom Audiences after vulnerability detected

thumbnail courtesy of marketingland.com

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