How Google Now, Siri & Cortana Predict What You Want

Google, Apple and Microsoft all have agents that want to be your personal assistant. But how well Google Now, Apple’s Siri and Microsoft’s Cortana can predict your needs depends on how much you want to share, how wedded to particular platforms you want to be and, in some cases, how much you actively want to help make those predictions happen.
Going Under-The-Hood
Ferreting out how these agents work is a challenge. The companies all have pages that describe Google Now, Apple Siri and Microsoft Cortana. But those are generally focused on what they can do, not how exactly they do it.
There are various help and privacy pages, but those aren’t always helpful. Google Now information is, in part, spread out across a page for the Google App for iOS and another area for Android. Cortana has a nice single page on privacy but still lacks specifics on some points. Apple’s privacy page notes that it doesn’t mine mail for ads, but neglects to

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