Today when I opened Empathy on Ubuntu 10.10 I got this unusual error box. I have never got this warning about an untrusted connection before.
What should I do? Is it a security risk if I continue without a second guess?
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There is a bug open on Launchpad relating to the DigiCert certificates not being installed:
If you're seeing this issue, please mark the bug as affecting you; it may help expedite a fix.
They let their SSL certificate lapse, while funny, not really a big deal with facebook. If it were say your bank you should back off. This was quite in the news but happened. No worries though. As you can see here it is not the first time they let it happen http://www.liewcf.com/facebook-ssl-certificate-6695/
I found this article.
The solution was to export DigiCert High Assurance CA-3 from firefox preferences
Edit > Preferences > Advanced > Encryption > View Certificates > Authorities
/usr/share/ca-certificates/mozilla (file owner should be root)
sudo dpkg-reconfigure ca-certificates and check all certificates including DigiCert High Assurance CA-3 which were previously unchecked.