It is very useful to graphic designers to build mood boards. You can find and store all kinds of images, colors, etc. on a particular Pinterest board. You can find great recipes on Pinterest. You can find all kinds of esoterical collections of things-—how to display houseplants indoors, cool mid-century furniture, DIY projects with PVC pipe, etc. It’s a super resource, NOT “just for chicks”.
That's why I characterized it as shallow. If it only appeals to people seeking bright, shiny objects, and not ideas, I'll just drop the subject.
“It is very useful to graphic designers to build mood boards”
Uh, oh. Now do I not only not know what pinterest is good for, now I find out there’s something called a “mood board” that I don’t know about what that is either.