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This paper describes a demonstration of an application called MoodChat. This application is built to showcase the Grapevine context sharing middleware. Grapevine provides a very lightweight but potentially lossy way to efficiently share context information among a group of co-located pervasive computing devices using just device-to-device connections to exchange small bits of context information. Further, Grapevine embodies abstractions that allow flexible definition of contextdefined groups,doi:10.1109/percomw.2015.7134022 dblp:conf/percom/DiazJ15 fatcat:pl7ervp4angj3n3ynymiqciujq