By MATT O’BRIEN and WYATTE GRANTHAM-PHILIPS (The Associated Press) Just how similar is Instagram’s chatty new app, Threads, to Twitter? In a cease-and-desist letter earlier this week, Twitter threatened legal action against Instagram parent company Meta over the new text-based app Threads, which it called a “copycat.” Threads has drawn tens of millions of users since launching as the latest rival to Elon Musk’s social media platform. Threads creators pushed back on the accusations, and legal experts note that much is still unknown.