How to share account between multiple persons

We have a single Ubuntu.cz community account, but there are multiple people behind it. Is it possible something like with Tweetdeck for Twitter, that you can grant another user to tweet in your name?

I believe this would be really helpful also for companies that would just grant such priviledge to their PR team member’s account without the need to share and rotate password of the “master” account itself each time someone is beeing on/offboarded.