What Does It Cost To Be Big On Instagram?

“It’s so fucking cold I’m going to freeze.” It was mid-January and 30 degrees outside, but getting the perfect ’gram is a year-round endeavor. So Mary Gui, a 28-year-old former advertising exec turned fashion blogger and Instagram “influencer,” who goes by @layersofchicblog, was wearing a sheer black dress for an outdoor photo shoot near the…