By using the Tweet Button, you agree to the Developer Rules of the Road.
Documentation You can add and customize the +1 button to meet the needs of your website, such as modifying the button size and load technique. By adding the +1 button to your website, you allow your users to recommend your content to their circles and drive traffic to your site.
Should I display the Like button by itself or the Like and Share buttons together? Like lets people post links to Facebook with one click, while Share allows them to add a personal message and customize their target audience before posting. We recommend that you include both buttons on your website to let people choose the way that they want to share your content. How do I display the Share button without the Like button?