[tomtang0514]

There're 3rd party trackers for ad network such as double verify, comscore, moat. But the technology on this works horribly. For example, if an ad network want to track thru a vpaid, it wraps vpaid on top of ad content and that's it. ( Say the ad is hosted by the ad network itself.) But if you want third party tracking, you first wrap your ad with one layer, then you wrap third party tracking as second layer on top of that, which makes things worse.