Spacebook is a wiki-based social networking site founded in late 2009. Its name is a pun on Facebook, the extremely popular online social networking site. Spacebook, being a wiki, allows people to edit each other's profiles. A profile on Spacebook is obviously just a user page, Spacebook being the MediaWiki-driven wiki it is. Very few people have set up profiles on it.
It has two articles in the mainspace and nine in the userpage space. Its front page boldly claims that the first hundred people to sign up will become admins.