AFAIK = as far as I know 据我所知

ASAP = as soon as possible 尽快

BBS = be back soon 很快回来

BFF = best friends forever 死党

BTW = by the way 顺便说一句

DAE = Does anyone else… 还有人……吗？

FYI = for your information 供你参考

IIRC = if I recall/remember correctly 如果我没记错

IMO = in my opinion 我认为

IMHO = in my humble opinion 依我愚见；恕我直言

OP = original post 楼主

OTP = one true pairing 天生一对

TBC = to be continued 未完待续

TBD = to be determined 待定

TTYL = talk to you later 回头聊

TIL = today I learn 今天学到了

AFK = away from keyboard 暂时离开

JK = just kidding 开玩笑

GTG = gotta go 要下线了

GOTDC = got disconnected 掉线了

SUP = what's up 干嘛呢

B4N = bye for now 再见