Another collaborative feature you may find useful is sticky note attributions. When one of your co-workers adds a sticky note to a whiteboard, it is tagged with their name at the top. If someone else edits that note, their name is added as well.
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By default, sticky notes show who created and who last edited them.
This feature is on by default but can be turned off: Click the gear icon at the upper right, and on the menu that opens, click Authors and turn the Show note authors switch off.