It's like porn! You might not be able to define intelligence but you know it when you see it.
Noam Chomsky points out we know English automatically, not through having been taught rules.
Similarly, I don't know have any references and artificial intelligence nor do I know exactly how does their search system works (well, I know page rank but I know they've done lots of work beyond it). But I can tell they're semi-intelligent by experiencing the semi-intelligence of their searching system. So they are an artificial intelligence company whether they say it or not, whether they know it or not, simply by the fact that what they create operates semi-intelligently to me.
Noam Chomsky points out we know English automatically, not through having been taught rules.
Similarly, I don't know have any references and artificial intelligence nor do I know exactly how does their search system works (well, I know page rank but I know they've done lots of work beyond it). But I can tell they're semi-intelligent by experiencing the semi-intelligence of their searching system. So they are an artificial intelligence company whether they say it or not, whether they know it or not, simply by the fact that what they create operates semi-intelligently to me.