We have added the ability for new users to register and login via Facebook! We are planning on adding Twitter Logins in the near future.
If you already have an account, you can link your Facebook to your current account by clicking your user name in the upper right corner on the site and selecting "Account Settings". Once you get to your account settings, then you can link your Facebook by clicking on "Facebook on the right side menu and then "Configure". Afterwards it is a simple process to link your account.