Not trying to be argumentative or anything, but is there something else (that currently exists) they can use that would get as many eyeballs on the alert?
What advantage does social media have over a basic website, other than the ability to spread through engagement? In a situation like this, I see no practical reason why they're not directing people to a government site along with social media.
I think the answer is just basic laziness, because it's easier to have some intern send a tweet than update a website, so we're offloading necessary functions to mercurial and unreliable capitalists. And that always ends well.....