Mikael: How to add the Google +1 (plus one) button to Tumblr
Adding the Google +1 button to your Tumblr site is quick and easy.
- Choose which configuration of the +1 button you want: +1 Webmaster Configuration Tool
- Visit your Tumblr Dashboard, click on ‘Customize’
- Click on ‘Theme’ on the menu bar and enable custom HTML
- Copy the following code…
Fuente: mikaelpittam
