It was only a year ago that Tweetmeme declared their intention to be the king of retweets . And for most of the past year, that was the case. Their retweet button was everywhere. Of course, that was before Twitter launched its own button last month. The result of that introduction? An immediate 20 percent drop off in button impressions per day, Tweetmeme found Nick Halstead noted today. Luckily for Halstead, Twitter let him know their button-killer was coming and gave Tweetmeme a chance to get out of the way. Twitter even agreed to license some of Tweetmeme's technology and enter into a business agreement with them about the button. The phrase, "killing me softly" comes to mind.