Got something to share with you guys.
There's a website similar with SBF in china ,
【紫禁城成人社区】☆ dmaaudio.com 最全面的北京信息交流平台! ☆ 庆祝论坛成立三周年！ - Powered by Discuz! (which is not available in china.... )
also got tons of FL information.
BTW:Ive been stayed in beijing and some other citys for a few years, if any of you got any questions about beijing can also ask me here.