GOD NO... I despise those share buttons nagging me on the screen and totally refuse to share in protest no matter how much i like a post.
An option that people can turn on is one thing.... assaulting the visitor with them is a turn off.
Big colourful buttons at the top and bottom sure.. but not nagging me all the way down the post.
I would be happy to settle for "Big colourful buttons at the top and bottom" :-)