Not me. Their ToS is horrible and pretty much reads they can use anything you upload there for whatever they want forever and not pay you. Well , that is what I remember anyway.
I don't use instagam for my commercial work but I post day to day photos there and in my profile I have a link to my main website so it may drive some traffic back to my site.
I put photos on Instagram that I can't sell on Pixels but link to my personal site here.
What I put up is *LOW RES* every time! And I make sure there's a filter on the pictures so stealing isn't be a big deal for me.
http://instagram.com/marqueeofstars