This document provides an overview of different types of mass communication on the internet, including mailing lists, newsgroups, RSS feeds, and podcasting. It describes what each type is, how they work, how to find and subscribe to them, and how to post and read content. Mailing lists allow groups of people to communicate via email lists on shared topics. Newsgroups are similar but store posts on servers and don't require individual emails. RSS feeds and podcasts allow following updates from websites through syndication and aggregation software.