For SOME posts it might have merit limiting the posts to 140 chars
but then we'd get that HORRIBLE mobile phone "text-ese"
Whenever I see any post where YOU is abreviated to u (or U) and other stuff such as UR (or ur) I just leave that post.
If people can't be bothered to communicate clearly emphasising their salient points - then why bother.
And BTW I HATE things like twitter.
Maybe George Orwell's "Newspeak" in his novel 1984 wasn't so far from the truth.
(For some of our more literally challenged readers this Novel forecast a socialist (Old school Soviet type) future where history was always being re-written to suit what ever the current conditions were. One of the main means of supressing expression of thought was to gradually modify the language by reducing the number of available words until it just contained what "The Party" ordained.
A great classic read BTW).
Here's a start for anyone interested.
Newspeak and George Orwell's 1984 - Charles' George Orwell Links