curl -I weibo.com
(the -I switch gives only the returned header). You see that the domain is redirected to www.weibo.com. It used to be that www.weibo.com redirects back to weibo.com, thus the loop. (The way you get out of it was to directly visiting your weibo profile (such as www.weibo.com/falcondai). I think they just fixed this problem in the past few days and www.weibo.com no longer redirects back to weibo.com

