@cyanotype
I do realise this is an issue! For me, it is something I would use in all communication 'For more information, see here' - simply because everyone *can* see it.
When people post 'For more info, see our FB page' it drives me bananas - because I don't *have* FB/IG/LinkedIn/whatever. You just lost me. I am *never* going to be a customer/sponsor/attendee - partly because I simply can't see your info & partly because I won't patronise establishments / events that aren't accessible. You are sending the message you don't care about everyone and message received.
You either have to have a publicly accessible website or something like Mobilizon. The more people who do this for every event, every convention, every clean-up-in-the-park notice, the more commonplace it will become! 😊