Kevin Kristopik, a 15-year-old who lives near Detroit, said he had to change his phone number after pop star Justin Bieber posted it on his Twitter account Saturday. Bieber deleted the number after sending it to his more than 4.5 million followers. But Kristopik told the Detroit Free Press that he still received about 26,000 text messages. Bieber tweeted the number after Kristopik apparently tracked down the singer's phone number. Kristopik wouldn't tell the Free Press how he found the number, but said, "I kind of meddled into his life a little bit.… He decided to take revenge on me." (Scott Legato/FilmMagic)