I sometimes like to share my answers to people who follow me on Twitter and more then once I got the question "hey how do you do that?" and I thought that's obvious right go to your answer and click on the "tweet this" button. But then I noticed that the share buttons aren't always available and I know I saw it before so where is it. So I asked this question When is the "tweet this" button visible? on meta.
It gave me the answer but wasn't really satisfied because I believe the current implementation confuses people and is the main reason why I got questions like earlier noted.
I know from other questions like Please ditch all of the share icons - they give me nightmares that there are people who hate this share buttons and I can empathize with them so why not leave it to the user.
So the discussion I would like to start is to leave it to the user and ditch the apparently confusing implementation.
UPDATE: With leave it to the user I mean that the user can enable or disable the share buttons in his account settings.