TWITTER - I fart around on here as @Author_LB , hanging out with other writers and the self-publishing community (it gets lonely sometimes), posting word counts to keep me motivated, and participating in writing sprints.
INSTAGRAM - I keep a photo diary of my daily life as laurabradburywriter : the good (my family, my writing life, and the beach), the bad (my rare auto-immune liver disease), and the ugly (even ugly on Instagram looks beautiful, which is why we are all addicted).
PINTEREST - Eh oui, I too have fallen down this vortex of gorgeousity. My boards are under my vacation rental persona as graperentals and will likely make no sense to others and illustrate once and for all that my brain is a messy place. However, suffice to say I have discovered the art of creating mood boards for my stories and I am hooked.