A survey of more than 2000 Americans was taken by a company called Intelligent Voice; the topic of the questioning was Siri. Those surveyed were asked if they used Siri on iOS 7, what they thought of the capabilities of Apple's voice activated virtual assistant, and whether Apple had oversold the public when it came to Siri...
Source: http://www.phonearena.com/news/Nearly-85-of-iOS-7-users-surveyed-have-not-called-upon-Siri_id48489
Source: http://www.phonearena.com/news/Nearly-85-of-iOS-7-users-surveyed-have-not-called-upon-Siri_id48489