Track-changes in #GDocs, plug-in that provides some functionality. However, wish #Google just had this built-in.
https://chrome.google.com/webstore/detail/track-changes/pgjeblaieehjmmahlikmifaggjckpcnp?hl=en
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linkstream2 microblog 
Best to comment on twitter via @markgerstein. Only use this space for comments that are untweetable!