Social networking sites such as, Facebook, Twitter, Linked In, as well as blogs just like this seem to be very popular. But are they useful business sales and marketing tools, or just entertainment for adults looking for their long lost high school sweet hearts?

Text advertising sent directly to you cell phone and services such as Cha Cha are also gaining popularity. But are these useful to business' or just entertainment for college kids?

How are you using the new social networking and text messaging tools? Is it working? Is it just plain annoying? Or, is it what in world is this guy talking about?