This book constitutes the refereed post-conference proceedings of 4 workshops, held at the 5th International Conference on Internet Science, St. Petersburg, Russia, in October 2018: Workshop 1 : Detecting Social Problems in Online Content, Workshop 2: CONVERSATIONS, Workshop 3: The Future of Decentralized Governance: A Workshop on Encryption,Blockchains, and Personal Data, and Workshop 4: Internet as an issue: An international workshop on governmentand media narratives.  The 20 full papers presented together with 4 short papers were carefully reviewed and selected from 38 submissions. The contributions of the Workshop 1: Detecting Social Problems in Online Content has united Russian scholars who work upon Russian-language datasets. Workshop 2: CONVERSATIONS: An international workshop on chatbot research and design regularly discusses the novel issues in their research and production area. Workshop 3: The Future ofDecentralized Governance: A Workshop on Encryption, Blockchains, and Personal Data. At this workshop scholars and industry representatives from France, the Netherlands, the UK, and Russia have discussed distributed governance technologies based on blockchain and other privacy-protecting technologies. Workshop 4: Internet as an issue: An international workshop on government and media narratives took a rare approach and regarded Internet as a focus for public discussion.