Answered by Susan, Hiring Expert at Praxair, Inc., on Monday, October 21, 2013
Good question! The answer is absolutely, they will care. Not only will they care, you will likely eliminate yourself from any consideration if you use informal communication.
Text and email grammar, punctuation (or lack of it) have one place - and that is with your friend and family network. Never with your business colleagues, recruiting agencies, or other professionals.
Regardless of how well you know them, you never know if that message/email/text will be forwarded onwards. I've seen many people incredibly embarrassed for messages they've sent, only to pop up and embarrass them later on.
If I received a message from a potential "applicant" that did not have proper grammar, I would never consider that applicant for any of my openings.
The applicants I send onward to my customers are a direct reflection of my ability to find "great, capable and professional talent" (which is what the customer is paying the recruiting agency for) and I cannot determine that about you if I get correspondence in the way you mentioned.