I think about using Tor for nearly everthing, including Facebook, because FB often tags the users even on other sites, for example per Like-Button, Cookies etc.
Now I think about using the Tor Browser to log in to FB, to use FB and then to use a new identity via Tor and to do other things.
My question is, how the Exit Nodes may sniff personal information (Cookies etc) that is transferred via FB. For example i read http://security.blogoverflow.com/2012/04/tor-exploiting-the-weakest-link/. There is described how Exit Nodes can do Session Hijaking (the Article is from 2012). Now I read somewhere else that now all traffic of FB is encrypted (since 2013).
Can an Exit node - theoretically - decrypt the Data that is sent via FB or can do a Man-in-the-Middle-Attack? I think if a MITM-Attack would be done, there would be a warning that the Certificate is not correct? Are there some other possible Attacks that the Exite Node could do - even if fb traffic is encrypted?
And, how secure is it to use other services, etc. for Example Chats or E-Mail (TorBirdy) via Tor (with SSL-Encryption)? Is this really that secure it is said to be?