Does Twitter Cost Anything?

I'm new to the Internet and I want to use that Twitter service I hear about on CNN all the time.
Does it cost anything? I visited the website but I'll only create an account if it's a free service.
Will I have to pay if I want to use Twitter?

Twitter is free. You can use it all you want, you don't have to pay for it.
Most websites are free, the best way to find out whether a website is free or not is to click on the Sign Up link. If you are redirected to a page where you are being asked for your credit card information, then you need to pay for it.
But websites like Facebook, Youtube, Fotolog are all free.

it is so cool

Of course, the problem is that many websites now want your email address on the first page of the submission form, so you have to give that just to find out if it's free. I would hesitate with anyone like twitter, due to that little trick to add you to advertising lists.