SwiftKey (on Android) scans previous text and email messages, if I'm not mistaken. The result is usually convenient, but it can be disconcerting - I had a frie

SwiftKey (on Android) scans previous text and email messages, if I'm not mistaken. The result is usually convenient, but it can be disconcerting - I had a friend borrow my phone to text someone and as he was composing his message, he continued to select the most suggested word until he'd completed an entire email I'd sent a week earlier verbatim...