Mobile ad networks have stopped using the UDID that Apple previously provided as a means to identify users, and is instead using proprietary techniques. As the Wall Street Journal points out, this practice is a little bit shady, but also, it isn’t as big of a deal as the Journal is making it sound. Of course ad networks will want to know who they are targeting ads to, and they will always find a way to do it. It isn’t some sort of shocking revelation.

[Source: WSJ]