I had never heard of GigJam before today, but it immediately impressed me. This Office365 service, which started out as a closed Preview then was opened to everyone on Windows, Mac, and iOS in June of 2016, is now out of its testing phase and finally available on the Play Store.

The idea is simple enough: you want to share a specific document or piece of information with someone to get their opinion, negotiate with them, give them advice, show them how things should be done, etc, but you don't want to share all the document and you don't want it to be available to them past the needed time.

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