What is the deal with young women (teens/early 20s) and the way they type?

Here are a few examples taken from a few girls on my Facebook.

- oh yeaaaaaaaaaaaaaa
– lovesssss being home, love you baby sooooooooooooo much ♥
– i loooooved our little hangout today:)
– sameeeee :)
– amazzzzing
– yessssssssssssssssssssss! love youuuu
– home friiiiiidaaaaaaaay !!
– jealouuuus!
– your not even gonnnna be home for new yearssssss as ifff
– i missss you tooo sooo muchhhhh ♥
– Yup and more skype convosss we talked longggg so much to say lol just mssg me when u wanna skype again!!

I just don’t understand it. I can understand saying “I’m soooo hungry” because the extra Os would be audible if one was to say the sentence. So all right, that’s for emphasis. Maybe with all voiced vowels.

But why “amazzzzing”? Why “longggg”? I thought the young’uns were into brevity these days, what with txtspk and all that.

There’s probably no “answer” to the question of why they do it, but has anyone else noticed this? Does this bug anyone else, or am I the only old codger who doesn’t get it?