It's easy to judge whether you're capturing your best side and features in the photograph.
If you have something on your face, in your teeth or coming out of your nose, a quick selfie will let you know straight away.
If you ever go missing, one look at your Facebook page and everyone will have a variety of images to recognise you by.
It's a great way to show off your new outfit or jewellery.
It's a great way to make people jealous when you're doing something really great, like lying on a beach on a Monday.
Your distant relatives will always know what you're up to and whether you've dyed or cut your hair.
Sometimes when you take a selfie, you capture things in the background by accident, like someone stealing a handbag. Solving crime, one selfie at a time.
If you're lying in bed taking a selfie and you drop your camera or phone, it'll probably hurt quite a bit.
You might not be aware of what's going on around you, like that ball that's headed your way.
People may think you're conceited... but who cares.