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Tech giants divided over digital assistants

Apple, Microsoft and Facebook are split on whether artificial intelligence with personality risks alienating users

Siri app providing additional information on Apple TV. Some academics say Siri's personality has been her greatest success: After her release in 2011, users raced to find all her quips.

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...

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