netmeg - 12:01 am on Jun 2, 2011 (gmt 0)
I use the horizontal button, and the medium size looked way out of alignment to me.
Who'll click on it? I dunno. People like to click on things. You can put up the lamest, shallowest page full of useless content you can think of, and some dweebs will come along and click a Like button on it. (I know; I've tried it)
If Google needs to be reassured that people like my sites, then I'll plop the buttons on them. I got room. And people love my stuff.