Google +1 Buttons on your web pages allow visitors to your site to recommend your content to other people. Google’s +1 annotations currently show up in SERP in US English language’s www.google.com.
Google +1 button is available in 4 different sizes:
- 15px (small)
- 20px (medium)
- 24px (standard)
- 60px (tall)
Insert this tag at where +1 Button should appear: