Many businesses don't have normal websites for better or worse.
Many government agencies announce things through Twitter and Facebook for better or worse (worse in my opinion).
Facebook could get their databases and backups wiped tomorrow and I'm pretty sure nothing would substantively change in my life or my work (and I work in tech). Same goes for Twitter. I might be exposed to less second-hand stupidity on an average day.
I see lots of hand-wringing about them being somehow equivalent to power plants or water districts, but to me it seems like a tortuous justification for "make them act how I want them to act".
> Many government agencies announce things through Twitter and Facebook for better or worse
Twitter seems to be the more common of the two there. They should not do that.