Which are the sources of siri?
According to ProgrammableWeb, Apple Siri uses more than 35 APIs [1]. For instance, Siri accounts for about a quarter of the queries fielded by Wolfram|Alpha [2]. Yelp is another of the APIs Siri uses [3].
[1] http://blog.programmableweb.com/2011/10/04/are-there-open-apis-behind-apples-new-voice-commands/
[3] http://officialblog.yelp.com/2012/03/your-iphone-personal-assistant-now-with-more-yelp.html
See also:
– Which topics on Quora are related to the technology behind Apple Siri?