cnbc said that The digital advertising world is scrambling to prepare for a seismic change when Apple updates its iPhone software in the coming weeks.The move, called App Tracking Transparency, or ATT, will force app makers to ask permission before they can collect a unique identifier on every iOS device called an identifier for advertisers, or IDFA. A significant proportion of users are expected to say no. Today, developers and advertisers use the IDFA to target mobile ads and measure how effective they are.
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