They can socially engineer but voluntarily, or in other words propose social norms in form of ux and product. But things get out of hand very quickly in a market. For instance, no one designed the method people use for retweeting, it wasn't engineered. Some decisions were made but with limited desires effect.
Similarly the market connects you to the real world. You put a product out there and it loves and dies on its usefulness to others.
Same with the rest. Everything is voluntary, which is kind of the point as opposed to mandated from top down.
Even big tech like Google have trouble controlling their own inventions. Think of SEO spam and bots, which is a constant battle. That's an example of the worse, but there are good things like distributing unfiltered information.