Twilight star Robert Pattinson has said he 'doubts' that he will ever join Twitter. The 25-year-old actor plays the role of Edward Cullen in the movie series and said he doesn't have any plans to join the social networking site. He said to The Hollywood Reporter: "I doubt it, I mean, I've been so passionately against it for so many years and I feel like, and I'd feel like I was selling out a little bit." Pattinson reprises his role in the new movie, Breaking Dawn: Part One….