I don't see wtf, brb, or lmao as pronouncable for some reason. I actaully say in my head what they mean whenever I type those or see them on screen. lol I can see myself saying, but I don't. Same with rofl. But I've only recently gotten into not saying that one in my head and just going with everyone else on "roffle". omg, stfu, etc. I they're just abbreviations for me. When actaully talking I say them out. Oh my god. Hell... I type them out almost all the time. I don't actaully use very many abbreviations...