Thanks for the query, @alis_campbell. This has come up before and been on our backlog since then. It is still planned - currently the team is working on a complete rewrite of our sharing system which once released will facilitate implementing the ability to share PDFs without annotations. Adding your +1 to the topic on our tracker for their consideration.
As for sharing to social, we do need to remove the G+ button but the Twitter / Facebook options should be there. Do they not appear on your end?
