Looking at the search results in yahoo and bing i notice pornhub gets their very own search bar embedded in the search engines for certain keywords, their domain being one.
http://www.bing.com/search?q=pornhub...=1-7&sp=-1&sk=
Ive been researching it a bit and found that it could have something to do with the use of microdata
http://www.entrepreneur.com/article/223074 but havn't found anything conclusive yet.
Was wondering if anyone here had any knowledge about this? Thanks!