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downvote
3 plugin
UpvotrA WordPress plugin to allow simple upvoting of post objects by a user.
Upvote / Downvote - Vote with a TweetAllows users to vote on a topic using Twitter. Display results in standard banner sizes on posts, pages or widget. Optional Adsense Revenue Share.
WP-redditAdds a link to respond to the post's individual listing on reddit, or submit a new listing.