The English language is a flexible thing. Some think that "y'all" is not 'proper', but name another single word second person collective pronoun in English. Some English in America also has "write me" instead of "write to me".
However, saying "I could care less" when you mean "I could not care less". There is no justification for such a heinous crime. Murderers can be rehabilitated, electro-convulsive therapy can take care of all manor of criminal perversions, so save your death penalty for when it is really in the public interest. For the unconvinced, the Guardian newspaper made a little video:
http://www.guardian.co.uk/commentisfree/video/2010/may/20/la...
How to pitch to an idea How to pitch to a journalist
... Flexible or not, that word fundamentally changes the meaning of the sentence
Honestly I thought "How to pitch a journalist" might mean how to endorse a journalist if it didn't happen to be a typo.
Interestingly enough, none of my friends from Georgia or Alabama use "Y'all" when writing/typing. I did a cursory search on Google, filtering to personal, and only found the slang used when joking about Southern accents.