Technical Twitter abbreviations:
•    CC = Carbon-copy. Works the same way as email
•    CX = Correction
•    CT = Cuttweet.  Another way of saying partial retweet
•    DM = Direct message. A direct-message is a message only you and the person who sent it can read
•    HT = Hat tip. This is a way of attributing a link to another Twitter user
•    MT = Modified tweet. This means the tweet you’re looking at is a paraphrase of a tweet originally written by someone else
•    PRT = Partial retweet. The tweet you’re looking at is the truncated version of someone else’s tweet.
•    PRT = Please retweet, a plea to put at the end of a tweet
•    RT = Retweet. The tweet you’re looking at was forwarded to you by another user

Industry Twitter abbreviations:
•    EM = Email Marketing
•    EZine = Electronic Magazine
•    FB = Facebook
•    LI = LinkedIn
•    SEO = Search Engine Optimization
•    SM = Social Media
•    SMM = Social Media Marketing
•    SMO = Social Media Optimization
•    SN = Social Network
•    SROI = Social Return on Investment
•    UGC = User Generated Content
•    YT = YouTube

Conversational abbreviations:
•    # = start to a hashtag, or a way of organizing subjects on Twitter
•    AB/ABT = About
•    AFAIK = As far as I know
•    AYFKMWTS = Are you f—ing kidding me with this s—?
•    B4 = Before
•    BFN = Bye for now
•    BGD = Background
•    BH = Blockhead
•    BR = Best regards
•    BTW = By the way
•    CD9 = Code 9, parents are around
•    CHK = Check
•    CUL8R = See you later
•    DAM = Don’t annoy me
•    DD = Dear daughter
•    DF = Dear fiancé
•    DP = used to mean “profile pic”
•    DS = Dear son
•    DYK = Did you know, Do you know
•    EM/EML = Email
•    EMA = Email address
•    F2F /FTF = Face to face
•    FB = Facebook, F— buddy
•    FF = Follow Friday
•    FFS = For F—‘s Sake
•    FML = F— my life.
•    FOTD = Find of the day
•    FTW = For the win, F— the world
•    FUBAR = F—ed up beyond all repair (slang from the US Military)
•    FWIW = For what it’s worth.
•    GMAFB = Give me a f—ing break
•    GTFOOH = Get the f— out of here
•    GTS = Guess the song
•    HAGN = Have a good night
•    HAND = Have a nice day
•    HOTD = Headline of the day
•    HT = Heard through
•    HTH = Hope that helps
•    IC = I see
•    ICYMI = “In case you missed it,” a quick way to apologize for retweeting your own material
•    IDK = I don’t know
•    IIRC = If I remember correctly
•    IMHO = In my humble opinion.
•    IRL = In real life
•    IWSN = I want sex now
•    JK = Just kidding, joke
•    JSYK = Just so you know
•    JV = Joint venture
•    KK = Kewl kewl, or ok, got it
•    KYSO = Knock your socks off
•    LHH = Laugh hella hard (stronger version of LOL)
•    LMAO = Laughing my ass off
•    LMK = Let me know
•    LO = Little One (child)
•    LOL = Laugh out loud
•    MM = Music Monday
•    MIRL = Meet in real life
•    MRJN = Marijuana
•    NBD = No big deal
•    NCT = Nobody cares, though
•    NFW = No f—ing way
•    NJoy = Enjoy
•    NSFW = Not safe for work
•    NTS = Note to self
•    OH = Overheard
•    OMFG = Oh my f—ing God
•    OOMF = One of my friends/followers
•    ORLY = Oh, really?
•    PLMK = Please let me know
•    PNP = Party and Play (drugs and sex)
•    QOTD = quote of the day
•    RE = In reply to, in regards to
•    RLRT = Real-life re-tweet, a close cousin to OH
•    RTFM = Read the f—ing manual
•    RTQ = Read the question
•    SFW = Safe for work
•    SMDH = Shaking my damn head, SMH, only more so
•    SMH = Shaking my head
•    SNAFU = Situation normal, all f—ed up (slang from the US Military)
•    SO = Significant Other
•    SOB = Son of a B—-
•    SRS = Serious
•    STFU = Shut the f— up!
•    STFW = Search the f—ing web!
•    TFTF = Thanks for the follow
•    TFTT = Thanks for this tweet
•    TJ = Tweetjack, or joining a conversation belatedly to contribute to a tangent
•    TL = Timeline
•    TLDR/TL;DR  = Too long, didn’t read
•    TMB = Tweet me back
•    TT = Trending topic
•    TY = Thank you
•    TYIA = Thank you in advance
•    TYT = Take your time
•    TYVW = Thank you very much
•    W or W/ = With
•    W/E or WE = Whatever or weekend
•    WTV = Whatever
•    YGTR = You got that right
•    YKWIM = You know what I mean
•    YKYAT = You know you’re addicted to
•    YMMV = Your mileage may vary
•    YOLO = You only live once
•    YOYO = You’re on your own
•    YW = You’re welcome
•    ZOMG = OMG to the max

Common hashtags and chats:
•   #BrandChat = private chat about branding
•    #CMAD = Community Manager Appreciation Day
•    #CMGR = Community Manger topic chat
•    #FB = The user is sending this post to Facebook
•    #FF = Short way of saying Follow Friday, or a recommendation that others follow the user
•    #in = the user is sending this post to LinkedIn
•    #LI = This user is sending this post to LinkedIn
•   #LinkedInChat = For general use questions and questions about marketing/self-promotion on LinkedIn
•   #Mmchat = Marketing and social media chat
•   #Pinchat = a chat for maximizing Pinterest use
•   #SMManners = Social media manners chat
•   #SMMeasure = For discussion of analytics and mesaurement, lead by MarketWire and Syomos
•   #SMOchat = Social Media Optimization chat lead by Stanzr
•   #SocialChat = Social media chat lead by SocialParle.
•   #SocialMedia = an all-inclusive chat for subjects big and small in the subject of Social Media