SAN FRANCISCO - When users ask Siri, Apple's digital assistant, what she likes to drink, she is quick with an answer. "I have a thirst for knowledge," she responds. Her counterpart at Microsoft, Cortana, opts for a very, very dry martini. But M, the digital assistant Facebook is testing, deflects the question. "I don't have an opinion about that. What's your favorite drink?" As the tech giants race to build ever better artificial intelligence platforms, they are obsessing over the nuances of their digital assistants' personalities. For users, digital assistants are a gateway to powerful artificial intelligence tools developers expect to influence major decisions...
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