On Thursday, Twitter changed it's blocking function, making it more of a "mute" function rather than a full-on block. Then, came the outcry. According to data reported by the Financial Times, about 160,000 tweets were sent about this change Thursday. The response: overwhelmingly negative. The company did an about face, reverted to the old policy. What does it say about the long-term growth potential of Twitter that users so adamantly want the ability to fully block other users?