Try using slideshare, this has some really useful presentations on that are also clear and easy to understand.
Rightly said. choose a proper name first, a niche related "decent pic", start with something fresh and intersting.
I find that twitter is best for customer service and gaining customer loyalty by being able to directly interact with the customer.
simple equation more followers = more traffic us some sites like bit.ly to track your links make sure tiwitter can suspend the account for strange activity '