Chinese-founded Agora, which a source says provides back-end communications tools for Clubhouse, rose 30% on Monday to $73.60 as Elon Musk joined Clubhouse (Josh Ye/South China Morning Post)

 Josh Ye / South China Morning Post: Chinese-founded Agora, which a source says provides back-end communications tools for Clubhouse, rose 30% on Monday to $73.60 as Elon Musk joined Clubhouse ... Read more »