There's something called AddThis (http://www.addthis.com/) that creates buttons for virtually all social networks and such.
Basically they give you some HTML code which you just paste in your html file and, believe it or not, IT. JUST. WORKS. PERIOD.
This is a VERY POWERFUL tool. I think everyone should use this in their games.
How can I integrate these buttons in my game?
Thanks a lot in advance.