But...
Many businesses actively block communication among employees, by e.g. forbidding the creation of teams in Teams. Some others have a policy to have HR or mechanical turks monitor Slack. Some others add your direct manager to every channel you are.
Why would the government want to facilitate communication between citizens?
I have thought about this, and the only idea that would probably be useful for public support is discourse in support of education/information.
Phrased differently, social media amplified disinformation. Arguably if done correctly discourse can be done without uselessness.
In other words, I would argue that social media could be useful for example: to provide near real time updates on public concern: Wildfires, for example.
But I would argue that you don't want government supported "influencers" or, you know, tax payer money being used to post cat memes.