Nice summary here of many internet-isms, including the meaning of maddening phrases like “i did it for the lulz” and “O RLY?” The original O RLY and YA RLY are here for your enjoyment:

If you are wondering whether or not you should read the whole long article, ponder the below LOLcats image. If you understand it, and why it is spelled that way, well then off you across the Bridge of Death! If not… you may want to RTFA. ‘Nuff said.