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Systems and methods for facilitating use of non-electronic whiteboards and other large displays. Images of whiteboard are input to a computer device to provide automatic detection of a collaborative portion of content on the board created during a collaborative session and distribution to relevant collaborators alone while personal content of board is not distributed. Modification history of writings are preserved and displayed as change histograms to assist a user locate content that may have been erased. User finds the content by inspecting regions of board that correspond to user's memory of approximate location and time of modifying the content and are shown on the histogram as having been modified. Persistent reminder notes that clutter board space are detected and stored based on their location on the board and duration of persisting on the board so that they may be erased.