Another one based on the logic that Google's users are more "tech savvy" (which I believe they, on average, are):
* A larger percentage of Bing users are doing "time-saving" searches, such as "hotmail" and "facebook", where they know the first result is what they want even before they search.
And extending that logic - a tech savvy audience will be more likely to have more complex results. It's not hard to give searchers want they want when they're looking for "superbowl results" or "justin bieber".
Here's what I observe among my non-tech friends: they have Google as their homepage. If they want Facebook, they type "Facebook" into the search box - even tho' typing it into the address bar would do the same thing. If they come across a PC that's not on Google, then they go to Google using the address bar and proceed as before.
* A larger percentage of Bing users are doing "time-saving" searches, such as "hotmail" and "facebook", where they know the first result is what they want even before they search.
And extending that logic - a tech savvy audience will be more likely to have more complex results. It's not hard to give searchers want they want when they're looking for "superbowl results" or "justin bieber".