I have Yamas on my N900 and ready to do an SSLstrip sniff on my home network to see if Yamas can capture plain text https credentials. I open port 8080 to 80 and set IP to 192.168.0.1)router). I go into my laptop and login into FB. SSlstrip just displays this on Xterm.

www.facebook
login:0056712453667687
login:0056712453667687

I see no plain text username/password. Do I need to add any other services or applications to Yamas?

Well Facebook log-in is always hashed. I only tested this once trying to see the log-in on my own non hashed log-in website.

Never tried Facebook to be honest. Since https is impossible(I am a real noob at this so don't take this as a fact)