New answers tagged sharing
You're going to need to change the privacy setting of the playlist to "Unlisted". Then you'll be able to share a URL with anyone who you want to be able to access the playlist. The playlist won't show up in search, so only those with the URL will be able to access it. You can change the setting back to "Private" again and then no one will be able to reach it ...
At this time is not possible. References How to share - Google Drive Help
Both Edit and Comment permissions allow users to suggest changes. References Suggest edits in a document - Google Editors Help
That is correct, you are not allowed to reward users for sharing. Users must share something because they really want to, not because they get rewarded for it. Btw, the feed dialog is deprecated, better use the share dialog. Afaik it is allowed on Twitter, at least i did not find anything about that in the terms: https://dev.twitter.com/overview/terms But ...
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