Twitter’s Blog post says,
We’re pleased to be working closely with the good folks at TweetMeme and, from here on out, they will be pointing to the Twitter Tweet Button. Check out TweetMeme’s blog to learn more about what they’re up to next.
and, Tweetmeme’s Blog post says,
What does this mean? Firstly we will be assisting Twitter with the technical challenges involved with the button and secondly we will be working even more closely in the future on delivering real-time curation of the Twitter Firehose. This will manifest itself in the launch of a number of new products and the first of these is being unveiled today.