Yes, right at the front page you can use your facebook account to post..
Not anymore. I completely removed the linking between Facebook and CC accounts on privacy grounds; same goes with Google analytics.
The FB comments plugin only remains on a few pages now.
That is only because some people don't know how to set up the security on their facebook page
Facebook connect shows on this page, i have it blocked through ghostery. Congrats are due though for the lack of tracking cookies on CC. Some sites i have visited have more than 20 including some of the most notorious privacy invaders like doubleclick.