GUIDE TO ONLINE SERVICES
Yellow is a chat app launched by Twelve App, aiming to provide the opportunity to start chatting with new users.
Yo is a very simple communication tool, available on iOS, Android and Windows Phone operating systems.
YouTube is a video-sharing social network which is owned by Google. Users can upload, view and share videos.
Created by Childline in the UK, Zipit aims to help teenagers deal with difficult sexting and flirting situations.