Google Docs
Yes, the 1% in regards to who you should share a document with or not! I get dozens of invites to edit a document I have no business seeing, I mention it to the Google Admin, I still get dozens of invites to edit documents I have no business seeing... I've been to his training course, he covers it in detail ~ chalk it up to 1% !
A pint as I don't have to put out this dumpster fire ;-}