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@AlderaanDuran used the term "time line" in the other comment and it made me wonder if you can make a timeline the central part of a crowd-reporting UI. Varying levels of zoom, attach events anywhere, some kind of consensus mechanism for moving events up or down in history or relevance as more accurate information comes in. Tablet hardware is perfect for this kind of thing, since moving through timelines and zooming in/out is much more intuitive and faster on touchscreens.