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"When you're sharing a file in Google Drive, your time should be spent collaborating, not arranging conversations. Right? Google agrees strongly enough to have just finished tweaking Drive's web interface for better teamwork. Users actively working on the project now show as mouse-over icons, with their Google+ relationship front and center -- if they're not friends and you want them to be, you can change that almost immediately. It's even faster to start group chats, as a new dedicated button will launch a chatroom for everyone who's currently looking at the project. Google expects the speedier Drive socialization to reach us within a day or two, and it's planning to bolster the update with wider file support sometime in the near future."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.engadget.com/2013/04/25/google-drive-lets-teams-add-friends-start-chats-easily/>