Twitter’s MoPub ad exchange grabs Verizon tracking cookies, and more may follow
Earlier this week we told you privacy and security critics were concerned about how Verizon inserts unblockable cookies into HTTP requests sent via the company’s wireless network. One of the major concerns was that other companies might use this identifier, called a UIDH, and potentially build a dossier on a user’s web usage.
Well, it turns out privacy critics were right to be concerned, because it looks like other advertising companies are using the identifier. MoPub, a mobile advertising exchange acquired by Twitter in September 2013, uses Verizon’s UIDH as one of several ways to deliver advertising to a device, as first reported by ProPublica.