lolz

You tell a really good joke to someone over your favorite chat application, and you want to know how funny you were.

heh/hehe < haha < hahaha < flol < soq < loq < lol/rlol < LOL < rofl/lmao/roflmao

Of course, there are other variations that you may run into. This is simply a high level overview.

A few words of wisdom and explanations:
1. flol = fake lol. This is used when you would type lol, but in reality you are not laughing.
2. loq = laughing out quiet. This is used when you find something funny and you're smiling. You probably would chuckle if they were in the room with you, or if you weren't at work where people can hear you.
3. soq = smiling out quiet. Same as above, but only in terms of facial expression. You probably wouldn't be laughing even if you could, but you have a big smile on your face.
4. rlol = real lol. This can be replaced by simply lol if you don't use flol. lol should be used only when you are literally laughing and it is audible. A chuckle is ok, but you may want to consider a lower form in this case.
5. LOL. You are laughing. If you're not laughing, don't type LOL. If you're not smiling, you disgust me. This should be the highest form of laughter abbreviation you should need. If for some reason it's not enough, consider adding exclamation marks, or even better, give details about your laughing. "Oh man, now everyone around me is asking me what is so funny because I was LOL" or "You almost made milk come out through my nose. I'm not even drinking milk!"
6. rofl/lmao/roflmao should never be used. For one, it's not true. Where's your integrity? If for some reason it was true, you should use it in the past tense, and give some explanation that it was really true. "I was rofl, and I hit my elbow on the wall."

Now most of you will probably think I'm adding new abbreviations here, and you're probably right. I find it gives me a few more levels of variation in describing how funny I think something is, while not sacrificing my integrity by lying. But... YMMV, HTH, TTYL.