In what was certainly a coincidence, the CEO of Apple (AAPL) showed up on Twitter the same day that the company’s new line of iPhones showed up in stores.
Tim Cook joined the ranks of the other business leaders and celebrities on the soon-to-be publicly traded social media platform. And, yes, it’s really him — the little blue checkmark is proof. Cook’s first tweet was a positive reflection on the success of the iPhone:
Cook is hardly the first CEO to join the social media site, though. There’s a long list of executives on the platform, although not all of them post frequently enough to show up in your feed. Here are five of the most interesting and active CEOs on Twitter.