Internet slang - How r u doin’?

XD 
es un emoticono comúnmente usado en Internet para expresar risas o carcajadas. La X indica dos ojos cerrados y la D una boca ..

XOXO
Hugs and kisses    O=Hug X=Kiss

El término XOXO es una expresión onomatopéyica que representan besos y abrazos (hugs & kiss), usada principalmente en ingles, aunque como palabra no tiene significado propiamente dicho, su empleo se refiere a una expresión afectuosa para despedirse, empleada normalmente en medios escritos (chat, correos electrónicos, ...

If you look at each letter like it was representing two people from a bird's eye view, the "O" represents the arms of those persons hugging each other while the "X" is evocative of two people kissing each other.

LOL
Es un acrónimo en inglés que significa Laughing out loud, Laugh out loud, o a veces Lots of laughs, traducido como «reírse en voz alta o reírse mucho ..

Top 50 Most Popular Text Terms
FYI - For Your Information

2moro - Tomorrow
2nite - Tonight
BRB - Be Right Back
BTW - By The Way -or- Bring The Wheelchair
B4N - Bye For Now
BCNU - Be Seeing You
BFF - Best Friends Forever -or- Best Friend's Funeral
CYA - Cover Your Ass -or- See Ya
DBEYR - Don't Believe Everything You Read
DILLIGAS - Do I Look Like I Give A Sh**
FUD - Fear, Uncertainty, and Disinformation
FYI - For Your Information
FWIW - For What It's Worth -or- Forgot Where I Was
GR8 - Great
ILY - I Love You
IMHO - In My Humble Opinion
IRL - In Real Life
ISO - In Search Of
J/K - Just Kidding
L8R - Later
LMAO - Laughing My Ass Off
LOL - Laughing Out Loud -or- Lots Of Love -or- Living On Lipitor
LYLAS - Love You Like A Sister
MHOTY - My Hat's Off To You
NIMBY - Not In My Back Yard
NP - No Problem -or- Nosy Parents
NUB - New person to a site or game
OIC - Oh, I See
OMG - Oh My God
OT - Off Topic
POV - Point Of View
RBTL - Read Between The Lines
ROTFLMAO - Rolling On The Floor Laughing My Ass Off
RT - Real Time -or- ReTweet
THX or TX or THKS - Thanks
SH - Sh** Happens
SITD - Still In The Dark
SOL - Sh** Out of Luck -or- Sooner Or Later
STBY - Sucks To Be You
SWAK - Sealed (or Sent) With A Kiss
TFH - Thread From Hell
RTM or RTFM - Read The Manual -or- Read The F***ing Manual
TLC - Tender Loving Care
TMI - Too Much Information
TTYL - Talk To You Later -or- Type To You Later
TYVM - Thank You Very Much
VBG - Very Big Grin
WEG - Wicked Evil Grin
WTF - What The F***
WYWH - Wish You Were Here
XOXO - Hugs and Kisses

TQM - Te Quiero Mucho