Why can a ‘friend’ on social media sites, not really be considered a true friend? what are ‘hidden rules’ for building relationships with people online?

a friend on a social media sites can pretend to be someone's that not them. you need to be really careful of who you as friends online.

there are a lot of hidden rules for being friends online that you need to follow to protect you self from someone that does not know you as good as your friends know you.
they cause your information against you and try to be your friend they after your information on social media websites. make sure that you know the person before becoming friends with them online. make sure you that are your friend and if they try ask you for your information. only give out your information if they are good friend you that you can trust them.
if you can not trust them as your friend do not be friends with them they are just using you and trying get you to do something that you do not want to do.

do you agree with this statement? why or why not?