If you have not created a company facebook page, you can go to the following link and make a company facebook page:
http://www.facebook.com/pages/create.php
From there, you can link to your twitter account and promote the facebook page.
You can create a link on your website via here once you have the facebook page:
http://www.facebook.com/facebook-widgets/share.php
This will give you an html code to place in your website that will show the Facebook logo button and when clicked will take them directly to your facebook page. Note - you can do the same for a twitter account. However, please take this as constructive cristism, you need to consider revising your site to work with mobile platforms. It's hard on my old eyes with an iPhone, but make sure it works on all mobile platforms, Flash doesn't work on iPhone for example. Don't limit yourself to just Facebook, there are tons of other sites to include, Digg, Fark, Delicious, MySpace, Mixx, Linkedin, and Stumbleupon to name a few. Also, the links are great for the help centers, but consider a pull down box, so a customer doesn't have to scroll by County.
And make sure you are getting links back for the ones you post as well as keeping info up to date, i.e. Christmas thoughts? What happened to Easter
Invest a small amount into Google key words (you pay per click - it's very small unless you are getting a few thousands hits an hour). Also, Bing is affordable right now as they are fighting with Google for business. If you have any other questions or if there is anything else I can do to help - pm me. Overall, outline is neat, simple, and to the point - exactly what a website should be.
JK.