You are correct, but GTalk was SSL disabled and Facebook Chat is both SSL disabled and has a long URL chat.facebook.com - both are, allegedly, popular servers.
If both were secured and Facebook Chat domain was facebook.com, then these two would not be listed uniquely.
I strongly suggest to use a normal XMPP server https://xmpp.net/
GTalk, CrapBook and CrapSpace are not as good.
P.S. Pidgin is buggy. Use Gajim or Psi+.