presearch.io
Presearch aims to be a decentralized search engine just like google, selling ads with blockchain software. They say they'll ward users for their usage.
Please read more on it on their website.
I think this will blow up, because people want somewhere else to search except google, it's obvious they don't like Bing.
I am not sure about combination of search engine and blockchain. It's very difficult to compete with giants like google. bing and duckduckgo have been around for a long time yet they're nowhere near google. It is a great experiment though.