WT:Social is a new and much-needed social network led by Wikipedia founder Jimmy Wales, which unlike Facebook, Twitter, and the other market leaders, won't make money on targeted (often intrusive or dishonest). Instead, like Wikipedia, it'll be run on donations. It's not however affiliated with the online encyclopedia. As Wales puts it to me: "This is just me having fun trying to invent something new."
You can go here to sign-up as Wales and his team scale up the system to take on more new users. "[We have] only 2 developers who are mainly scrambling to keep the site running," Wales explains. "I am hopeful that the waiting time will end in a few weeks time as we beef up our infrastructure (again!)"
While Facebook in particular has ongoing controversies with real name identities, and the company's insistence on them, Wales tells me WT:Social will have a more nuanced approach to that question. When I ask him, "What's WT Social's policy around anonymous/pseudonymous user identities, such as game handles?", here is his take in full: