Today, Musk followed CZ again after replying to CZ's tweet.

Yesterday, CZ posted a message saying that he was happy to contribute to the acquisition of Twitter (X), and retweeted the news that Binance invested $500 million in Musk's acquisition of Twitter. Musk responded to this

What is Twitter? Someone just asked me! I just posted an article to explain it

Twitter is X, which is Twitter. You don't need to study what project it is.