So, finally, Google today, wrapped off the cover from "+1 buttons" to the whole web. As a result, you might start seeing +1 appear on sites large and small across the Internet, including Google properties such as Android Market, Blogger, Product Search and YouTube.
"The +1 button can help publishers, too. As potential visitors see recommendations from their friends and contacts beneath your Google search results, you could see more, and better qualified, traffic coming from Google. The next time your connections search, they could see your +1's directly in their search results, helping them find your recommendations when they're most useful."
"Adding +1 buttons to your pages is a great way to help your content stand out in Google search. By giving your visitors more chances to +1 your pages, your search results and search ads could show up with +1 annotations more often, helping users see when your pages are most likely to be useful," Google said.
"When a user clicks +1, that +1 applies to the URL of the page they're on. There're some easy ways to ensure your +1s apply as often as possible to the pages appearing in Google search results."
"+1 primarily caters to users outside of the US and Canada, and already supported in 44 languages. However, +1 annotations currently only appear for English search results on Google.com," Google stated.
If you want to +1 search results and search ads earlier, you can opt in through experimental search site. To see recommendations from your friends and contacts in Google search, make sure you're signed into your Google Account.
For more information about the +1 button, you can watch this short video:
[Source: Google blog]