The answer is that Siri users would need to issue approximately 50 to 75 queries every day.

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So why would they, and their users, need Facebook to add a social layer atop it?

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This would be a major hit to the bottom line, as Netflix would need four new streaming users to compensate for every DVD customer lost, Wible said.

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Facebook, Gmail and other ad-supported online services would need to start charging users if proposed changes to EU data protection laws go ahead, a legal expert has warned.

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The only cog in the machine would be that eventually HelloSign would need to get a plug-in for users of various other email accounts including Yahoo and Hotmail among others.

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Also, the ePaper initiative would need to look at how to manage the relationship between users and their paper, Brass said.

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With storage getting smaller even as capacity increases, Dulaney suggests there may not be a need for some users to carry a mobile computing device who otherwise would.

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Mr Systrom acknowledged that terms and conditions would need to change in the future to accommodate new revenue models, but pledged to keep users fully informed of any plans.

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