Semantic—look at all the stuff on a search results page these days. A lot of it is social, some may be semantic.
Open communication/data transfer—although much data is proprietary, Facebook makes data available in order to sell advertising. The Pew Foundation offers data sets free to other researchers.
Mobile and geolocation. It is always interesting to ask a class how many people have a smart device within reach. Most of them do. Are they thinking about the fact that the device knows where they are? They know it, but they may not be concerned.