How does a parent spy on a 21 year old facebook?

[johanas]

He could have made a fake account and friended her on that or he probs logged into her account, this can be done at anytime, aslong as u know the email/phone number of someones accound u can type something into the password box to log in without having to change password or stuff, i wont say the thing u type in cause its wrong to log into someones account unless they have given u the password

hope this helps btw if he logged in with the password trick thing, it only works once so he cant do it again