I will put $100 down right now that if you did a statistically significant, unbiased, controlled, representative sample of verified Twitter users - as in people you can provably show are actual human beings - you'll find the majority are left-leaning.
Oh wait, I don't have to, Pew Research Group already did it...
https://www.pewresearch.org/internet/2019/04/24/sizing-up-tw...
Facebook is a different animal because more than half the planet uses it, and what we consider "left" or "right" as Americans is dramatically different than what other nations would consider "left" or "right" or "liberal" or "conservative".