Another embarrassing outage for Facebook: The homepage for Facebook.co.uk is displaying a set of directories, as if the server had been wiped clean. Before you blame Facebook COO Sheryl Sandberg for this one, check out the domain-name registration. Facebook.co.uk is registered to one Cameron Winklevoss; last year, it displayed a placeholder homepage. So who's Cameron Winklevoss, and what makes this deception so intriguing?Cameron and his twin brother Tyler famously sued Facebook founder Mark Zuckerberg, claiming he copied the code for his site from ConnectU, a similar social network they asked him to help code while they were all students at Harvard. Facebook and ConnectU settled the lawsuit earlier this year. One wonders if Facebook's lawyers forgot to ask for the UK domain name.