there are social media manager programs that help people schedule posts and let multiple people use the same account (particularly useful if you are something like a news organization)
When speaking "letting multiple people use the same account", one thought that come up in my mind is not how convenient it will be for news organizations or other forms of social groups which may need this function on social media, but how do these platforms ensure that there's no data leaking, as whoever can log in, also how do these platforms protect the safety of these account including passwords. From my stand point, it might be a dangerous to allowing multiple device login to the same account