identifier for advertisers

A change giving Apple users more control over their data has cost four major tech companies nearly $10 billion in lost ad revenue according to one estimate. But the drop is nowhere near as big as Facebook had warned. The change, which took effect in ... April, affects a tag called Identifier for Advertisers that links to a specific iPhone. It lets advertisers combine data from multiple sources and build up a picture of the device owner's interests, helping them better target advertising. Individual apps must now ask for permission (via an on-screen prompt) to access the tag, giving users greater ... (view more)