Desklib is an online library for study material with solved assignments, essays, dissertations, and more. The content includes a chapter or journal article review on the impact of Snapchat on teen murders in the UK, a review of the TV series 'Gangs of London', and typewritten notes on lectures about gangs and social media and the history of youth violence and culture. The subject, course code, course name, and college/university are not mentioned.