Regarding search engines, we all know that Google is on top, with more than 75% of the market share. More than 3.5 billion searches are performed on Google every single day.
Do you know which site comes in next as the second-largest search engine in the world? If you guessed Bing, you'd be wrong (as of the publishing date of this post, it's in the #4 spot). The second-largest search engine in the world is YouTube (which is owned by Google… meaning they dominate the first two spots).
YouTube is the second largest search engine considering users, searches, and time spent on the site.