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, Andworkshop 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.