Search engines view the number of likes your page gets as an indicator of your website's popularity and usefulness, so it's pretty obvious that if you can increase that number, then your ranking will improve. It's obviously not the only factor in the page ranking, but it's quickly becoming one of the main ones. It's not only search engines; your website's visitors also use these indicators as a sign of trust.
But you can't get likes if you don't have a button on your site. You can get some easy copy-and-paste buttons via AddThis or ShareThis, but you can also get them directly from the source.
Facebook Like - http://developers.facebook.com/docs/reference/plugins/like/Nows the time to add these buttons if you've not done so already. Your page ranking might depend upon it.
Twitter Tweet - https://dev.twitter.com/docs/tweet-button
Google+ - http://www.google.com/intl/en/webmasters/+1/button/index.html
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