I don't click share buttons because I don't know what it's going to do. I don't want something copied that says "Check out this Thing on this Site! <url>" because then I have to delete half of it at which point it's slower than copying the URL. If every share button had the same behaviour then maybe I would.
So true. I too dual as an automatic link cleaner.
When I receive a link with a 100 character hash attached I gasp and yell at the person who sent me it (my wife normally)
This. It may copy a url or it may automatically send me to my Facebook profile and prepopulate a post. Very rarely do share buttons copy a simple meaningful url to my clipboard.