I wonder about the future of sailing on social media. My observations, and these are averages: Boomers have taken over Facebook and appear to have driven most of the millennials to Instagram. FB groups give me an outlet for photography and some writing.
Millenials own Instagram but you'll find some mix as with all groups. I haven't gotten into Instagram as I'm too wordy and enjoy writing and photography. Plus it's phone cam easy and a pain if you use and SLR. But I go there to see what my millennial adult kids are doing.
Gen-X (40 - 45) in sailing also is strong on main stream social media, joining boomers on FB.
Gen-Z(youngest sailors) are with the millennials to Instagram), or tick tock (so I'm told but don't go there, I'd feel like a Pedo. )but they will probably rebel when 'their' platform is invented, likely in the future.
The classic sailing forums hold the oldest (on average) group of sailors on social media, in my experience. I like this form of communication as it's polite and thoughtful and involves the most amount of writing, so you learn things. I'm afraid the lack of young members may be unsustainable for 'us', but the forums chug along.
Youtube is a sailing dessert from my view. I've found some great stuff (and friends) but you have to control the algorithm or it will lead you no-where sailing, just people desperate to make a few bucks.
The good news is, from what I see, sailing is strong across this broad spectrum.