It's only "much harder if not impossible" for lack of trying. And while yes, there are some out there that simply don't have such options, we also have people that need to cut down a tree but can't afford the work, and so simply hope it won't fall on their house the next time it gets windy.
Email lists and chat servers are just Facebook with extra steps. The only difference ends up being the fact that Facebook-like social networks suggest you people and content you might like from a giant pool, whereas the alternatives have rather limited pools and the signal to noise ratio is pathetic because you get literally everything that is posted and have to filter through it manually.
Don't get me wrong, I hate Facebook and only use it on maybe a handful of occasions per year, but you can't tell me that it didn't enable things that weren't possible for many before it was invented.
I do not have any accounts in my real name, and I had no problems finding others via our pseudonym's when I wanted to share them with people in the physical world.
In all discussions I've heard that mention "exclusive value" or a similar concept, the agreed-upon definition was always something like "where all others are orders of magnitude worse".