http://tags.library.upenn.edu/tag/tagging+recreation PennTags Feed http://tags.library.upenn.edu/makerecord/url/2285 http://tags.library.upenn.edu/makerecord/url/2285 Allows users to store, tag, and share locations -- based on google maps, but does interesting things. Users add photos of places, and lots of other tagged info about the places.<br />