What online marketplaces like LinkedIn exist for the creative class?

There are a lot of platforms for creative professionals. One of my favorites is Working Not Working. This platform is for any professional with a portfolio, from illustrators to animators to copywriters. Professionals compete to get in, and like the academy awards, are judged by a panel of their peers. Applicants can reapply with new work as many times as they like.
The founders of Working Not Working, two former creative directors, also understand the pain of rejection for creatives, since the rejection is a bit more personal than it might be for other disciplines. As such, they have a podcasts series to discuss those issues as well as other freelance challenges. Others just for creatives include: Boonle, a platform for creatives just starting out; Contently, a platform for writers; I Love Creatives, a platform for , guess what, creative talents of all sorts; Patreon for U Tube artists; Smartshot for camera and video pros, and Clever, a platform for bloggers and social media influencers.
In addition, many platforms with broad skill offerings include creative projects. These would include Moonlighting.com, Upwork. com, WorkHoppers.com, TopTal, Fiverr, and Thumbtack.