Encouraging Tweets of the current page has become one of the most powerful ways to attract extra traffic and help viral effect. Tweetmeme button is probably the most popular way to do that, however more and more often I come across blogs that use a similar one provided by Topsy. So what’s the difference between the two Twitter buttons? Tweetmeme button Topsy button Tweet count yes yes Where the Tweet is generated pop-up new tab Twitter authentication required yes no Shortcode yes yes WordPress plugin yes yes Tweeted status Retweet / Tweeted no Page RT rank no yes Look Tweetmeme WordPress