Social Media Marketing

These tools bombard us with a lot of information, wondering if some people who get overwhelmed (like myself) have less capacity to make sense of all this information than people who use it frequently? Thinking of doing a study and wondering if anyone else sees a correlation between that or not.

I know Facebook, MySpace and Twitter are great ways to help promote my company, but I don't have the time to learn them. How much would a marketing firm charge me to run my social media?