The +1 Button of Google is Currently available for US English searches on www.google.com.
If any webmaster enabled +1 button for their site or blog, you can see it there . we also enabled plus one button on this blog.
Plus one is Globally available on Google.com . you can use it without any programming language. to see your all plus one pages, visit +1 tab of your Google profile ( here is link http://profiles.google.com/me/plusones).
If you own blog or website, and want +1 button, simply Go to link ( http://www.google.com/webmasters/+1/button/index.html ). choose +1 of your choice and get code provided by Google and put it into any social sharing part of your site.