What are people's thoughts on combining social graph + blockchain + decentralized search? The idea is that your searches will be somewhat similar to others in your community, so the crawl index is sharded/partitioned to optimize for social graph proximity. If you want to index pages non proximate to you, you can get paid Bitcoin to do it.

This could be implemented with xmpp (lookup socialvpn/ipop project) for social layer, chord dht for search, and Altcoin with modified pow for incentive.