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Limit Ad tracking is an iOS system setting. For Android you can set "Opt out of interest based-ads" (Accounts -> Google -> Ads). You can set both before upgrading the app and no scan will take place.

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I'm pretty sure that Android setting opts you out of Google-interest based ads, ie the same setting you can change via https://www.google.com/settings/u/0/ads

I doubt that changes anything for Twitter. AFAIK it doesn't stop an application doing scanning like this.

It doesn't forcefully stop apps to do this but Twitter reads and obeys that setting.

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