An anonymous reader writes: Earlier this week, your Facebook posts could have been rewritten on the Great Wall of China, not just on your friends’ walls. For about 30 minutes on Tuesday morning, Facebook traffic in the US, or at least the connections going through AT&T’s Internet services, did not travel via the most direct route. Normally, AT&T passes packets of data to US-based Level3 Communications, which in turn hands them off to Facebook’s servers. Instead, the connections went the long way: through servers owned by China Telecom’s ChinaNet, the state-owned ISP of mainland China, and then to SK Broadband, a commercial ISP in South Korea, before finding their way to Facebook.