發送短信 : Identifying and targeting the initial adopters for optimal social contagion

  ______    _____               ______    ______  
 /_   _//  |  ___||     ___    /_   _//  /_   _// 
   | ||    | ||__      /   ||   -| ||-   `-| |,-  
  _| ||    | ||__     | [] ||   _| ||_     | ||   
 /__//     |_____||    \__ ||  /_____//    |_||   
 `--`      `-----`      -|_||  `-----`     `-`'   
                         `-`