In recent months, question-and-answer start-ups like Aardvark, which was acquired by Google, and Quora, which recently raised $14 million in venture financing, have led a new generation of search services that zero in on specific questions rather than search terms.
Mr. Leeds said that the new interest in questions comes from the evolving needs of people who do not want to spend a significant amount of time searching on the Web.
“There are still some things that Google doesn’t do very well,” he said. “They are just trying to get you in the neighborhood of an answer. We want to deliver that answer.”