Well I’d just tell them if I was recommending it to a friend or making a post like “follow me to mastodon” or whatever, and someone curious enough to find mastodon without a recommendation oughta be able to figure out an instance to join, mastodon.social is the first result when searching “mastodon” so it’ll probably get them just based on that.
Which was itself riffing on The Minority Report by Phillip K. Dick from 1956 .