Twitter works for me as a source of the latest news, but not for business. I never joined FB based on what I learned back in '06 about some of the funding from a DARPA agency (TIA).  I don't really get Instagram or posting pictures as a vehicle to advertise my app, Simple As 123. I'm actually developing a YouTube channel with my business partner as a platform to share some of our innovations in binaural beats/subliminal affirmations. So I have to say that YT is the social media that I use for business.