какие есть еще английские сокращения на письме? типа r-are,y-why,w8-wait,2-too и т. д.

ty - thank you, y(r)w - you are welcome, imho - in my humble opinion, lol - laugh out loud, ro(t)fl - roll on the floor laughing, ro(t)flmao - roll on (the) floor laughing my ass off, wtf - what the fuck, bb - bye-bye, brb - be right back, gj- good job, gl - good luck, hf - have fun, l2p - learn to play, fo - fuck off, stfu - shut the fuck up, om(f)g - oh my (fucking) god, lpb - low ping bastard, u2 - you too, aka - also known as, afaik - as far as i know, btw - by the way, gr8 -great, gtg, g2g - got to go, dunno - don't know, k - ok, lmao - laughing my ass off, m8 - mate, np - no problem, pls - please, ppl - people, sry - sorry, 10x - thanks, 80m (atm) - at the moment, afk - away from keyboard, asap - as soon as possible, cos, coz, cuz - because, cu - see you, dw - don't worry, fui - for your information, gtfo(h) - get the fuck off (here), idd - indeed, irl - in real life, jk - just kidding, kma - kiss my ass, l8r, l8a- later, mofo - motherfucker, nc - no comment, mb - maybe, plz - please, pov - point of view, pos - piece of shit, rdy - ready и еще до фига. World of Warcraft многому научит...

Ой, да их много:
4 - for, B4-before, U - you, doN - doing, c ya - see you, Xing - crossing.

погуглите l337 sp34k