This YouTube Video (listed below) demonstrates how inadequate a spoken search engine might be. It's difficult to look for the best terms, and how do we understand how a post about a product or services is really described. Visual Definitions might be an answer for a lot of cases.
See video on Youtube - When Words Fail!
However all that is altering with the new visual systems emerging from communications research laboratories across the world.
Find out more at http://markhat.com/new-visual-communications-technology-points-to-a-visual-world