Well, look at Facebook and their marketplace and then you know what you can sell on social media. Nearly everything is possible.
Facebook is also using data generated by the users them self, but this i don't think is gonna happen in this project?
I don't think this was their intention, but people started to use facebook to sell stuff, so they probably just made a strategic move on it
They probably didnt, but when you look it like that, social media is a perfect way to sell stuff since is one of the most visited platforms on the internet and people are using it daily. I am sure Sphere will also be a popular site to sell some stuff.