aristotle - 7:23 pm on Jun 24, 2011 (gmt 0)
I don't think that would be an issue: 1 point for those having, 0 point for those haven't.
Why should Google give a site extra credit just for having one of these buttons? To me, they are a sign of a low quality site. And even if it turns out that Google does give credit for them, I'm still not going to put them on any of my sites.