Lighthouse International Group promises to help people realise their dreams and ambitions, but the reality is more sinister.

Lighthouse obsessively records and stores mentoring sessions and group calls. But when people ask questions or try to leave, that’s when the trouble really starts.

BBC Trending's series Trolled lifts the lid on online abuse and trolling on and off social media.

Presenter: Catrin Nye

Producer: Ed Main

Editor: Flora Carmichael