M.B can’t be reduced to stereotypes, of course. But there’s also a bar to entry into this social-media network, and it’s a distinctly technophilic, first-world, Western bar.
You can only say this because I suspect you're comparing it to platforms that are massively larger by many orders of magnitude. You can't compare it to Twitter or Facebook yet. In fact, if you were to compare it to them, then it would be to their early versions. Twitter was very technophilic for almost all of it's first three years until it crossed over into the broader conscious in early 2009.
Your argument is somewhat akin to doing a national level political poll and only sampling a dozen people in one small town.