Maybe a better question is, who cares? This Slashdot headline says a new lawsuit will ask to assign 50% ownership to Paul Ceglia
Ok, that story is not very interesting. The interesting story is that neither Zuckerberg nor Ceglia invented the concepts at the heart of Facebook. Check this story (mp3) about a group of Stanford computer science students who designed and implemented a Facebook prototype, prior art in 1999. The irony is that the Stanford faculty thought it was an invasion of privacy and forced the site off of the web.
This blog post is a good cross reference to this post because it also discusses the marketing strategies at the heart of social networks, such as Facebook.