You can test it yourself.
1. Install
Live HTTP headers.
2. Disable all cookies.
3. Allow facebook.com in an exception.
4. Log into your Facebook account.
5. Turn on Live HTTP headers (Tools menu)
6. Go to cnn.com
7. Look for connections to facebook.com
I went through the all steps as described. This is the relevant section from the recording:
Code: Select all
Host: www.facebook.com
User-Agent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; de; rv:1.9.2.3) Gecko/20100401 Firefox/3.6.3
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: de-de,de;q=0.8,en-us;q=0.5,en;q=0.3
Accept-Encoding: gzip,deflate
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive: 115
Connection: keep-alive
Referer: http://edition.cnn.com/
Cookie: datr=1274388733-d22cbe3837090ab3678d125052db5e1a3f42c79dd13dc4cf3f7cb; lsd=OJYIX; lxe=erunno%40xxx.tv; c_user=1646103119; lo=hmeQ5pDn6NyrpGPdrBvKLA; lxs=1; sct=1274388744; xs=c30f9427964ff12c78f133d63653336d; x-referer=http%3A%2F%2Fwww.facebook.com%2Fhome.php%23%2Fhome.php; presence=DJ274388745G35H1L1646103119MF274388746076WMblcMsndPBbloMbvtMctMsbPBtA_7bQBfAnullBuctMsA0QBblADacMutP274388745Z900BlcMcvrA_7bQQQ
Pretty much all relevant cookie data: Your login email address, the unique facebook ID stored in the cookies, etc.