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[Edit Description]
RSS readers are becoming much more than just that. Google reader in recent times has been focussing more and more towards the social networking aspects. Sharing, Comments and notes have been great, so it has become a breeze to let your friends know what you are reading and what you think about them.
Source (prasannag.com)
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javascript%3Avar%2520b%3Ddocument.body%3Bvar%2520GR________bookmarklet_domain%3D%2527http%3A//www.google.com%2527%3Bif%28b%26%26%21document.xmlVersion%29%257Bvoid%2528z%253Ddocument.createElement%2528%2527script%2527%2529%2529%253Bvoid%2528z.src%253D%2527http%3A//www.google.com/reader/ui/link-bookmarklet.js%2527%29%3Bvoid%28b.appendChild%28z%29%29%3B%257Delse%257B%257D
note
Disabled by google, not working anymore.
