Which was not why I became an early adopter of the +1 button and put it on sites I own. I included it because I wanted to optimize my sites for "social search". I hate mousehover popups and I'm not going to hand over screen real estate to google on my sites. Another js include bites the dust.
edit to clarify. I own sites that deal with a niche subject. It's not tech or science related. The first google service I threw out were ads. Sites with a niche subject get very poor quality ads, some even slightly insulting to the kind of folk I want to reach. I also invested quite some time to interconnect pages across the site for relevance. I don't want people to think that page x is the next place to go to because of some google signals.