Kirsten examines her latest selfie. She thinks she looks good - but maybe there is some room for improvement.

Her filtering app is full of suggestions. She can whiten her teeth, remove her spots and swipe away the circles under her eyes. Within minutes the picture is transformed: now she can put it on Instagram!

These are just the basic things she can do with the FaceTune 2 app. If she wants to go further, she can narrow her face. She can even change the shape and size of her eyes.

FaceTune 2 has been downloaded over 200 million times. To some people, using it does not seem a big deal. But others worry about the effect of such apps, particularly on teenagers.

Research by the soap company Dove found that 80% of girls have used an app to change their looks by the age of 13. Of those who do, 48% worry about their appearance.

According to psychologist Jordan Foster, they are learning that "editing their photos is what makes them good enough, not their personality or hearts".

More and more often, he says, they are "coming to counselling, presenting their Instagram accounts and asking the same question: 'Why don't I look like that?'"

In reality, only 5% of girls and women have the ideal looks typically shown on social media.¹ Researchers at Haifa University found that the more time girls spend on platforms like Facebook, the more likely they are to develop anorexiaAn eating disorder and serious mental health condition. It causes sufferers to attempt to keep their weight as low as possible. or bulimia.

Norway has a law saying that influencers and advertisers must make it clear when they have altered a photo. MPsMembers of Parliament. MPs are elected to represent people in 650 different geographical areas.  in Britain and France are considering similar ones.

But some claim this is an attack on freedom of expression. And Brandon B, an influencer with 5.6 million YouTube followers, supports the apps. He says they help give shy people the confidence to appear on social media.

Yes: There is nothing worse than people who have too high an opinion of themselves. The greatest religions preach the importance of humility. We should not judge others by appearances, or ourselves.

No: Everyone naturally cares about how they look. We should all try to be the best version of ourselves, in appearance as well as everything else, and there is nothing wrong in taking pride in that.  

Or... It is a sin, but only a minor one. It is not nearly as bad as sins that directly affect other people such as anger, which often leads to violence, or greed, which deprives others of their fair share.

Anorexia - An eating disorder and serious mental health condition. It causes sufferers to attempt to keep their weight as low as possible.

MPs - Members of Parliament. MPs are elected to represent people in 650 different geographical areas.