[mvandemar]

This makes a lot of sense, and would have be easy enough for Google to test as well, creating some tiny, brand new, never before heard of test search engine that Bing would have no reason to copy, see if the same thing happened.

[user24]

That would be a nice way of testing it.

edit: I'm not even sure if it's only search engines that are being analysed by Bing or all pages, but it's possible that it is just SEs - they could be capturing query terms distinctly.

[mvandemar]

They also probably should have tested to see if it happened with results other than the ones in the #1 spot.

[recoiledsnake]

Also, why did the experiment succeed for only 6 or 7 of the 100 terms that they tried? There's more than what meets the eye here, regardless of the hype and everyone jumping on the bandwagon.