My site is corruption-watch.com, with a theme similar to Drudge. I want the button to appear only on the homepage, but when I deselected posts and selected pages and hit save settings, your plugin always selected posts as well as pages. This caused me to get a +1 button under every link on my homepage.
I've deactivated the plugin now. If you see a +1 on my page it's because I put it in manually.