The +1 button is Google’s answer to Facebook’s ‘Like’ feature. Whilst any webmaster can add a +1 button to their blog by adding a small piece of code, Google has announced that from today users can add the +1 button to any individual page on Google Sites by selecting +1 Button from the Insert menu:
Alternatively, you can add it to your site’s sidebar and display it on each page instantly. Simply edit your Site Layout under ‘Manage Site’.
Google started rolling out the +1 button back in March. And now there’s a simple way to add it to your Google Site!