FWIW, there are far more businesses on social media than that. There’s an entire culture of chefs, makeup artists, and the like that advertises solely on twitter/instagram/etc. Social media is actually a really effective tool to reach your target audience in these cases.
Isn't that covered under "influencers"? What tangible benefit does Twitter provide to a working makeup artist (ie someone doing makeup for films/tv/photography/etc)? Sure, there are makeup artists that run businesses on Twitter, but their business is selling branded makeup and promoting sponsored products. That type of business is 100% reliant in social media, but aside from influencers are there any working professionals that would be unemployed without Twitter or Instagram?