Add Facebook-Like or Google 1 to each comment

Hi,

I just went over one of my blogs. I just read some comments and thought “why shouldn’t there be a Facebook-Like-Button or a Google+1 for each comment?” Just like it is in Facebook.

No I know that comments.php is different for each theme, but does anyone have an idea how it might work?

(I think this topic belongs to WP-Advanced, but I am not allowed to start a thread there.)