A pop up like the one shown in the series of screens below is related to the Apple Ad Identifier, which is used to better personalize ads for Apple users. It is shown in app upon account creation or, if you are changing from an Android device, your first log in on iOS.

Users who choose to enable tracking have reported receiving more relevant ads. Regardless of the selection you make, PhotoCircle never shares your data with third parties.

You can enable or disable this setting at any time under Settings -> Privacy & Security -> Tracking.