lol means laugh out loud and jk means joke
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Just a couple of examples of IM (instant messenger) speak.
Most people just use a few examples, like the two above, but others will post on forums ect using the full set of abreviations. It makes their speech look like gibberish and I have deleted posts in the past that have too much of that talk in it. If I need to read a post 5 times to understand it, it goes
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Anyway, hi everyone. Hope you are all well and happy
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