1 - haha - sitting there staring at the screen, said only to make the other person feel good about their story.
2 - lol - sitting there staring at the screen, said because the person thinks what the other person said could be accepted as funny, but doesn't really find it funny at all.
3 - lmao / lmfao - sitting there staring at the screen, said because the person thinks what the other person said is a little hilarious and puts on a small and unnoticeable grin.
4 - LOL / LMAO / LMFAO - the person looks at the message, reads it over again to make sure he's reading it right, then leans back in his/her chair with a kind of big smile, because he thought it was a little more funny.
5 - HAHAHAHAHA - the person looks at the message and thinks its pretty funny, and begins to give a small, quiet laugh, because he thought what the other person said was just plain funny.
6 - LOLOLOLOL - the person thinks the message was pretty funny and gives a slightly louder, but short laugh.
7 - A combination of 4, 5, and 6 - the person thinks the message is very funny, and starts to laugh really hard.
(guy 1 types in "haha lol")
Guy 2: Dude you aren't even laughing, the E-Laugh Scale was right. LIAR!!"
Guy 1: STFU