Expedia.com subsidiary TripAdvisor has announced that they have acquired EveryTrail. EveryTrail is a GPS publishing platform company that allows people to add walking tours and hiking trails. The terms of the details were undisclosed. EveryTrail founder and CEO Joost Schreve said that the website created over half a million travel experiences across 160 countries thus far. They have also added over 2 million geo-located photos since they launched in October 2006.