what to do when people ask for nudes on teenage social medias (teen perspective)?

Teen should say NO.

I would send a pic of my Big Fat Boooty.

Let's look at it this way, Emilie. If you knew that if you took a nude pix of yourself of any body part, that it would end up on the front page of your newspaper, would you do it anyway? What if someone showed this pix to your little brother or sister? Or perhaps your grandmother?

How likely would you send it if you knew that as soon as you sent it, the police were to knock on your door and arrest you for child pornography?

The police are trying to stop kids from sending these pix, in order to keep them safe, so they are cracking down on the sexting. 14 and 15 kids have been arrested for sending nude pix to each other.

Nothing that you send electronically is safe. NOTHING.  Once you hit SEND, the temptation is too great to show it to everyone.

Besides, wouldn't you want to be known for your discretion and for saving that private part of you to someone who will respect all of you, not just your naked breasts? My advice - just say no, thanks.

You have total control over what you do and don't do.

Well, to decline "nicely," I would tell them you might consider a thumbnail head shot without a hat on for 1 billion dollars.

That way you haven't really said "no," so they can't give you a hard time for not posting one.

And yet you have given them an option to get one if they want---yet they obviously will be unable to meet your "condition" of giving you the 1 billion dollars.

Effectively, you have made getting what he/she/they want want from you their problem.

just ask "would you do it?" cuz i think most people are not even willing to do such shameless things.