Love/Like/Upvote Button
Add a Twitter style love/like/upvote button to your content.
Plugin Tag: upvote
Applause/Like/Upvote Button
Add an applause/like/upvote button to your content.
WP-reddit
Adds a link to respond to the post's individual listing on reddit, or submit a…
Upvote / Downvote – Vote with a Tweet
Allows users to vote on a topic using Twitter. Display results in standard banner sizes…
Upvotr
A WordPress plugin to allow simple upvoting of post objects by a user.