Facebook admits it DOES use ‘shadow’ phone numbers uploaded to boost account security to target ads Prison Planet.com Posted on September 28, 2018 Posted in Aggregated No Comments Tagged with Sci Tech Daily Mail | Facebook has confirmed that advertisers use ‘shadow’ phone numbers to serve up targeted advertisements. Share this:Share Share on Facebook (Opens in new window) Facebook Share on Reddit (Opens in new window) Reddit Share on X (Opens in new window) X Share on LinkedIn (Opens in new window) LinkedIn Email a link to a friend (Opens in new window) Email