Everybody who is diving off to take advantage of this trick, <i>stop</i>, its not true.<p>The opensearch protocol describes the onsite search interface, so browsers (that support it) can add that search engine as an option. So, in effect, the opensearch link on the AirBnB sist is just saying "hey, if you want you can access the AirBnB search engine straight from your browser".<p>It has absolutely nothing to do with how google (etc.) index and display your site in their search results.<p>Instead, the AirBnB homepage comes up as 'AirBnB' (mostly) because it has a huge number of trusted incoming links containing hypertext 'AirBnB'. Google treats these as kind of 'alternative title text suggestions', and if you get enough they can override the actual page text in some cases.<p>So the trick is (as always) to link build.