Her shyness literally has nothing to do with her promoting stuff. You people are ridiculous.
Yeah it depends on what you classify as 'promoting'. Her FB is quite clearly promotional as they only post pics of her magazines, PVs, albums or lives. Never does Namie just pop on and post something random. And since FB (and even twitter for that matter) can just be managed by her staff, it doesn't affect her 'promotion'.
But Instagram is different. Her staffers taking selfies aint gonna do anything - it has to be Namie who takes pics and stuff. So clearly her shyness would stop her from doing that. That's cool.
The thing is, Instagram isn't really about promoting. I was checking through CKAY's and yeah she keeps mentioning her songs and new stuff, but its just selfies of her chilling, partying or working out - which tbh is just a casual instagram account.
Namie isn't actually shy about taking pics though. Remember during the BEST FICTION tour, i'm pretty sure she kept like a blog or something. I remember her taking pictures and stuff from behind the scenes. You can even see in the DVD/BR during the dancer intro in WOWA how Namie has her phone out recording it. She clearly isn't shy about taking pics - heck why would she be she's stunning.
So yeah... why she isn't on Instagram... idk. It's weird coz neither is Ayu or Kuu. And Ayu actually uses Twitter - i would have thought that she atleast would join.
OK correction, Ayu just joined instagram like 4 weeks ago. She only has 1 pic though.