I don't think that anyone should feel obliged to use social media, but at the same time, nor do I think that anyone who chooses not to use it should feel that they should drive the agenda for those who do, if that makes sense?
I have friends who complain that groups we use (things like craft groups or coffee mornings - all loosely 'run' local things, with no charge or organisation behind them) have Facebook groups that are used for communication (eg cancelled meetings, or changes to arrangements) because they (the friends) are 'not on Facebook'.
The choice is theirs - either use it, (even if only for that), or don't, but it is very entitled to expect others to ring round to let everyone know something, when they can just send a message that everyone who has bothered to sign up, free, on a computer, tablet or phone that we all have, can get in seconds.
I think that information sent by organisations such as councils or the government should be available on and offline for now, as there are still people with no access to the internet who need to know about services they need, but can see a time coming when this will no longer happen.