見過或常用的：

• AFAIK - As Far As I Know, 就我所知
• AFK - Away From Keyboard, 放棄吧，人不在
• BRB - Be Right Back, 馬上回來
• BTW - By The Way, 順道一題
• FYI - For Your Information, 給你參考
• IMHO - In My Humble Opinion, 依我個人淺見

這啥鬼？

• GD&H - grinning, ducking, and hiding
  (微笑、閃避，然後躲起來)
• GD&R - grinning, ducking, and running
  (微笑、閃避，然後逃走)
• GD&RVVF - grinning, ducking, and running, very, very fast
  (微笑、閃避，然後快速逃走)
• BTDT - been there, done that
  (順利達成任務)
• BTDTBTT - been there, done that, bought the tape
  (順利達成任務，買到了錄音帶)
• BTDTGTTS - been there, done that, got the t–shirt
  (順利達成任務，拿到了 T 恤)
• BTDTGTTSAWIO - been there, done that, got the t–shirt, and wore it out
  (順利達成任務，拿到了 T 恤，又穿破了)

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參考資料：立即訊息中的縮寫及速記法