Vertical search is not prevalently utilized by users of the big-three search engines (Google, Yahoo! and MSN). 35% of search engine users do not use vertical search, and 25% do not recall if they have clicked a result after having used vertical search (60% combined), according to iProspect. A result presented after an “image search” is clicked by 26% of users (the most frequently clicked vertical search category). The second most commonly clicked vertical search category is “news search” at 17%, followed by “video search” at just 10%.