Young people are deserting Facebook according to a European study and featured in The Guardian.
You may need to think about where the young people are going if your business is aimed at younger consumers. You may run a charity working with young client users and want to improve your communications with them.
The article says 16 to 18 year olds are increasingly using Twitter, Instagram and Whatsapp to keep up with their friends. The best way to find out how to reach your audience on social media is to ask them.