From their homepage:

Dreamwidth Studios is a home for creative artists of all types. Share your writing, your artwork, or your innermost thoughts. Find others who create the sort of things you like to enjoy. Control who can see your creation with our fine-grained privacy controls. Participate in communities for any one of a hundred topics. We are an independent, Open Source, community-centric service, and we support diversity in all its forms. Come dream with us.

Sounds like another social media platform.