Not having social media accounts was acceptable in 2007. In 2019, there's no excuse.
Forget about analyzing the immediate cost-benefit analysis here, because you can't. You need to at least be present in the places that the younger generations are so that sympathetic-minded people can find you if they come looking.
The problem is
I'm not saying NOT to have a social media presence. I'm saying it isn't like a booth at the county fair. It's even less like a town meeting podium. It's a means of communicating with people who quite literally already "like" you. (And as an added bonus, you get to contend with trolls who will NEVER like you, and who are only "communicating" with you to be disruptive.) And they're only going to come looking if they know there's something to look FOR.
The major criticism of "social" media in terms of societal impact has been that it does not foster exchange of ideas, but, rather, tends to create echo-chamber silos of the like-minded.
That organization I mentioned earlier: I joined quite literally at the suggestion of "the guys at the shop." I had just spent $2000 in furtherance of a new activity, so becoming part of an advocacy organization for said activity seemed like a Good Idea. Of course, I walked into the shop prepared to spend two thousand dollars. But I never would have realized there was an advocacy organization - or that it was needed - were it not for them. And even so, for years I was the guy who sent in his $35 dues, nothing more. It took going to an event, which turned into another, to persuade me to become a volunteer, then volunteer leadership. (First year of membership: 2004. That first activity: 2012.)
The one thing we struggle in with that organization: people (both potential members, and others in a position to assist with that advocacy mission) don't know we exist.
The thing WE struggle with is community-wide recognition of what's happening politically.
In our case, I'm betting there's at least a suspicion held by many/most people that something's not quite right. What we need to do is come up with a way of affirming that in people's minds, demonstrating what it is, and providing a path to a solution. And yes, social media can help with that, only once the initial contact has been made. Other than that, you're the Maytag repairman waiting for a call.