DuckDuckGo was launched in 2008 and has since become the foremost search engine for those concerned about not just snooping by the government but Google as well. When visitors search via DuckDuckGo, the search engine doesn’t track them; it just gives them the search results they request. (Like Google, DuckDuckGo does serve contextual ads, which is how it makes its money.) - from here.
PRISM fears are growing. And in this context location sharing is much more important area. So, pay your attention to our WATN approach. It lets you share location info without saving all your data on some centralized (read - PRISM-ed) store. See WATN related info in this blog or our Peer to Peer Location Sharing article, for example.