I’m pretty sure Mark Hamill‘s Twitter account only exists at this point to 1) debunk Star Wars rumors, 2) explain behind-the-scenes Star Wars trivia, 3) troll Star Wars fans with nonsense, 4) troll non-Star Wars fans with nonsense, 5) post political stuff.
Article source: https://www.cinemablend.com/news/2476117/star-wars-mark-hamill-is-still-trying-to-debunk-the-false-luke-and-carrie-rumor