Musk replied: "Increasing long form to 10k characters soon, along with simple formatting tools." "And making it much easier for writers to charge subscription fees for premium content." Musk had also said earlier this month that the company will extend "longform tweets" to 10,000 characters. Twitter Character Limit: Micro-Blogging Platform To Soon Increase Long-Form Tweets to 10,000 Characters, Says CEO Elon Musk.