Twitter tests Reddit-style upvote and downvote buttons - Twitter will test the use of Reddit-like upvote and downvote buttons as a way to b... - http://feedproxy.google.com/~r/Techcrunch/~3/MrVmMhp1W18/ #socialsoftware #conversations #socialmedia #likebutton #downvote #twitter #reddit #social #tweets #upvote #tc