Another important issue is text-talk. Trying to read something like this:
'2day was gr8, ttyl, cya!'
is a really annoying thing to do. I doesn't really save time typing and it certainly doesn't save time reading. I take about twice as long to read text-talk than I do to read normal writing.
A warning: if you write in text-talk; I or one of the Administrators or Mods will come and either delete your comment or edit it so that it is readable.
I'm going to go scientific for a moment - Many children in this age have lower spelling standards than the generations before them because they spend time writing
'wat? oh I dunno. wateva...'
It's just annoying. So don't do it. Please.