Really? Who is doing this kind of research into candidates? When I interview people I don't have time to check out their entire social media history. There are also plenty of people that complain that their interviewers don't take the time to check out relevant things like github so I don't think I'm alone in this. If your interviewer has the time to waste checking out your entire Twitter feed then that sounds like a possible sign of a dysfunctional workplace.

There's automated platforms to find candidates social media profiles. It's pretty standard these days.

Finding social media profiles is easy. Reading the content takes time. I'd guess places that go through your social media are probably just doing quick searches for terms like the company name or the n word. I also doubt its standard practice at most companies I'd be interested in working for to go through social media for roles that aren't public facing.