Out of curiousity.
I update my Instagram almost daily with new art, works in progress, and final products. The reason why, is because its on my ph and in my hand and very easy to upload/tag/add my photos and design. Unlike Behance or Dribbble it is a long process to add projects and arrk to your portfolio, so I'm not nearly as consistent with my Behance compared to my Instagram.
I'm the Senior/Lead designer at my current job right now and I, personally, would accept an Instagram page for a portfolio if I were interviewing somebody new. Is this professional? Should I not? What do you think?