How to record what the user is doing on my nokia lumia 925?

[Windows Central Question]

sometimes I let someone use my phone and I wonder if she is spying on my fb, whatsapp messages or something, is there a way to record what she is doing? and how?

I have windows 8.1 installed not 10 yet

 

[RumoredNow]

Don't give out your phone. Put a Pin lock on the main screen when turning on the phone.