Site.com
- Sites.com is meant for business users as there is no coding mandatory. Business users can easily create their own websites and it uses a Sites.com Guest User License.
- Public (unauthenticated) sites only which means no Authentication are supported
- Custom coding using HTML, CSS, Javascript, No VisualForce, Apex support as of now.
- CRM Content objects are not supported. Allows read only access to some objects through the objects data elements.
- Two types of users – Publisher and Contributor. Publisher is super set of Contributor.
- Chatter supported for contribution of content while chatter is not available on the front end website.
- Drag n drop support for CMS.
Force.com Sites
- Force.com sites supports both authenticated and public websites
- Support for custom pages using VF, JS, CSS etc
- Main targe audience is developers
- Access to all Force.com objects
Thys Michels Blog 
I was recommended this web site by means of my cousin. I am now not positive whether this put up is written via him as no one else understand such specified about my problem. You’re amazing! Thank you!