Because of its successful offshoot, DataSift, TweetMeme has decided to shut down. This announcement may come as a disappointment to users who depended on the service to accumulate tweets based on subjects and organize accordingly but CEO Nick Halstead believed it just made sense to close the doors. “We will be sad to see TweetMeme go, but it is no longer competitive or cost effective for us to continue to keep the infrastructure going behind it.” [Source The Next Web]