Rebecca Sparrow is an author (amongst other things) and champion of tween and teen girls. Her book, Ask me anything, is one of my favourite resources for teens. She has a PDF of free resources available on her website including a list of inspirational people and organisations to follow on social media, great books to read and websites to visit. You can sign-up for it here.
The Supre Foundation, together with the Telethon Kids Institute and Headspace, have put together this fantastic little book about Bullying. It is full of useful tips and information about bullying, friendship, self-esteem and staying safe online. Best of all, it is free! You can pick one up at your local Supre store or download one here.