Twitter Launching Official Tweet Buttons
Twitter just launched their official Tweet this button – about time … it comes in three versions (110×20, 55×20, 55×63) with five different settings for customization. You can set the URL obviously, the Tweet text default, via @SapientNitro or some user, related, and count box position.
You can see it server directly from Twitter here .
Step-by-step instructions by Mashable :