Actor Mark Hamill is calling on other Twitter users to boycott the site on Aug. 1 in an apparent attempt to protest Elon Musk’s ownership of the social media platform that's rebranding as "X." "This will only be effective if EVERYONE refrains from tweeting (X-ing?) on August 1st a/k/a #TweetlessTuesday. Let's show the owner the POWER OF THE PEOPLE. Honestly, would it kill you to keep your thoughts to yourself for 1 d--- day? Read a book!" Hamill told his fans Sunday. The "Star Wars" actor also made another call to boycott Twitter on Saturday. "Looking forward to taking a...