Kik is a free messaging app used by 300 million people worldwide that lets users exchange messages, photos, videos, GIFs and webpages via a Wi-Fi connection or data plan. Kik is unusual in that your child can sign up without a phone number and then find and message other people via just their username. Kik is aimed at anyone aged 13 years and older – the app says teens between 13 and 18 years old will need parental permission but it does not verify ages. The link below gives you a parents userguide to Kik: