Instructions for adding the google plus button to your website. Its is very easy. Click this link, this page mentions that a user clicking on the button may cause Google to crawl your website more frequently.
The link below contains information on how to add meta data for your Google Plus One button http://www.google.com/webmasters/+1/button/#customize-snippet
This can be a controversial topic for two experienced PHP developers with a preference for either platform. I am a huge fan of Drupal, but I use more Wordpress...