You can put this in your header right after the <body> tag and it will automatically float in the bottom right corner. I made this to attract attention without being annoying, and it will fade behind your content if the screen is too small to display. You can modify the first purple text to change the way this looks, the second and third are for the Twitter button. Another thing you can do is make something similar to this and embed it in the top left corner of your posts wrapped around your text. You can see a demo of this script at seo articles.