As Elon Musk awaits his doctor’s permission to fight Mark Zuckerberg in an on-again / off-again cage match, the two billionaires’ companies continue to spar in the consumer adoption arena. Meta forged ahead with Threads’ aggressive update schedule today as it tries to challenge Musk’s erratic X (rebranded Twitter). Zuckerberg announced today that the young platform now supports sharing posts to Instagram DMs, custom alt text for photos and videos and a new mention button.The Send on Instagram option lets users publish their Threads posts directly to Instagram DMs via the Send button. The feature could be seen as one of the “retention-driving hooks” Meta cooked up to ensure “people who are on the Instagram app can see important Threads,” as Reutersreported Chief Product Officer Chris Cox said in a recent company meeting. The strategy is allegedly tied to reports of falling engagement after the fledgling platform added over 100 million users in less than a week. Z