I think you misunderstood socialism if centralized control was what you took from it. The are both centralized and decentralized varieties, the operation is in common good (or purpose). Most of the organizing principles at a microlevel you can find in non profits, co-ops etc, none of which demand any market conditions at all. Governments maintaining socialist claims often muck this up.
The phrase "From each according to his ability, to each according to his needs" is definitely in line with the philosophy at play. There's not a lot of profit motive to be found. It didn't even have to be divorced from self interest since we all want a better platform.
I can respect a view that software is not politics, but the intentions to it are certainly wrapped in expression. Here the primary controllers were corporations of your bits and they are put sociocratically back in your hands like it or not.
But importantly you can't take your ball and go home. What you contribute here lives in a zillion caches.
Edit: 'r'
The reality is you already know there are people to do much of that job. A local ran a BBS for a town of 15k where I lived growing up. The moderators at Reddit were never paid, but they did it.
Point taken they whether they will do it here, but I think the descent from ubiquity to hobbyism again might do social media some good.
I've been through the collapse of the last vestiges of both Usenet and independent message boards, so I'm familiar with the perils of funding, and the deceptive costs of free. But wikipedia lives, hell even headfi still lives, there is a place within any market to be carried by it's enthusiastic.