Social Media???

What is your take on kids and social media? 

I have three kids and I have rules on social media at our house.  One, you may not have any accounts until you are 13.  Two, I have your password to check up on your account and read your items as I wish.  Three, you will be my friend.  Four, I can delete your friends if I feel that what is being posted by them is inappropriate. 

I have these rules so that I can try to help keep them safe, not to rule their lives.  I have read things on my daughters account that I find questionable but these are things that will not harm my child or anyone else, so I do not react to those items.  The items that I do react to are things that are derogatory to another human being or there is discussion about things she is not ready to be a part of.  I realize that these choices I have made for my child may not be what other people choose for their kids, so why does everyone have to tell me why their way is better?  Why am I judge for not changing my views to match yours after you have told me how I should do things?  I believe that there is many ways to raise a child, why does everyone have to do the same style of child rearing? 

Do we all have to have the same idea to raise responsible and moral children?  If someone else chooses to not allow their child on a social media site, does this mean I should try and change their minds because I allow mine on them?  Do I try to change their minds to make myself feel better about the choices I have made? 

Raising kids is a hard enough job, why can't we just support each other in the choices we make and if we make a mistake (which we all do) lets help each other out!