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Yelp – A social review platform and search engine that allows users to leave reviews for businesses. Yelp also offers an advertising program which gives advertisers the ability show their marketing assets to qualified Yelp users based on keyword searches.

YouTube – A video sharing website, bought by Google in 2006. YouTube is part of Google’s ad network. Youtube is currently the 2nd most used search engine in the world.

YouTube advertising – YouTube offers advertising in 6 different formats. Display ads, overlay ads, skippable video, non-skippable video ads, bumper ads, and sponsored cards. These ads can all be created and run through the Google Adwords platform.

Yahoo! Search – the third largest search engine in the US, owned by Yahoo. As of 2009, the engine has been powered by Bing.

Yahoo! Advertising – Yahoo and Bing ads are both run through the Bing Ads platform. These search engines share advertising networks.