I want to add Share this plug-in. Ref:http://sharethis.com/publishers/get-sharin

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  ishitaunblogged · Member · Oct 30, 2011 at 5:31 pm

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  I like the big buttons plus more sharing options in Share this button
  Blog url: http://ishitaunblogged.wordpress.com/

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  staff-blorbo · Staff · Oct 30, 2011 at 6:57 pm

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  We don’t allow plugins on WordPress.com for security reasons. Plugins are a feature only available for self-hosted blogs provided through WordPress.org.

  Plugins

  However, we do have our own built-in sharing buttons.

  Add Social Share Buttons

  For more information on the differences between WordPress.com and WordPress.org, please see:

  WordPress.com vs. WordPress.org