Facebook Questions beta is the social site's most recent feature launch. It allows users to crowdsource their own questions by submitting them to all of Facebook's 500 million users as well as to all their friends.
Let's be cautious about running too far with these numbers, but Royal Pingdom (using data from StatCounter) has reported/estimated Google's global mobile search.
At one time, IAC's CEO Barry Diller thought his Ask.com search engine could take on Google. But Diller effectively threw in the towel yesterday on an investors.