Re: @Len - Forget technology
Nobody (let me repeat that - NOBODY) is "reliant" on FB or Twitter. Neither platform provides anything essential to life. In fact I would say that both provide something that is detrimental to life overall, even if you don't use the platform (because of the environmental impact).
But, as others have already noted, the issue is basically that in a "decentralised" world (of Samsung and iPhone mainly) is still gatekept(?) by the OS suppliers. And besides all that, a truly decentralised (==Libertarian) world is one where barter is the only realistic means of exchange. It's anti-social in the most basic sense of the word, and none of us are actually really ready for that.