Which protocols use facebook???

Wireshark shows me only https with tcp everywhere.

because that's what Facebook is using.

Is it possible to encrypt this to see what protocols are using?

You need to decrpyt the traffic, however, that's near to impossible, as you certainly don't have access to the private key(s) of the facebook servers, do you?

If you are trying to decrypt the traffic of your own browser, you could tell the browser to expose the SSL/TLS session keys and then use that to decrypt the https traffic. Alternatively you can use a proxy that is able to do SSL/TLS decrpytion (like Fiddler). See my answer to a similar question.

http://ask.wireshark.org/questions/29936/decrypting-ssl-traffic-in-wireshark-processed-by-sslsniff

and some other resources.

http://www.cloudshield.com/blog/advanced-malware/how-to-decrypt-openssl-sessions-using-wireshark-and-ssl-session-identifiers/
http://www.root9.net/2012/11/ssl-decryption-with-wireshark-private.html

Regards
Kurt