Tagwhat leverages crowdsourcing, publisher partnerships, open sources like Wikipedia, and proprietary algorithms that analyze Tagwhat stories to identify related content.
Along the lines of HipGeo, Tagwhat lets users make a personal travel journal of the places they have been. Different (and better?) than HipGeo, Tagwhat allows the addition of multimedia stories about those places, all from iPhone and Android mobile devices.
SOURCE LINK to the full article: http://www.gadling.com/2012/09/09/geotagging-brings-mobile-tour-guide-to-the-world/