To make this work in BV, the following is placed in the End of Body tab (Page HTML> End of Body): (function() var po = document.createElement(‘script’); po.type = ‘text/javascript’; po.async = true; po.src = ‘https://apis.google.com/js/plusone.js’; var s = document.getElementsByTagName(‘script’)[0]; s.parentNode.insertBefore(po, s); )(); Use an HTML box to place where you like it on your page.
See the article here:
How to make the +1 Button Work