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.