I have used Pinterest since I was in college. I've found personal use (decoration ideas, recipes, outfit style inspiration, and hair cut options, to name a few reasons), parenting (bedroom decorations, hair style tips, and potty training tips), and professional use (small group lesson ideas, book related lesson ideas, room arrangement tips, and lots of printable resources).
Some boards I follow are:
https://www.pinterest.com/themeasuredmom/teaching-preschool/https://www.pinterest.com/pocketpreschool/preschool-sensory/https://www.pinterest.com/myonlysun/_saved/