GitHub has introduced activity feeds that are categorized into three types: events for you, events from you, and public events from you. These feeds are designed to help users stay informed about activities related to repositories they are watching or users they are following, as well as their own public activities. Access to private feeds is secured through HTTP authentication, requiring a GitHub username (or email) and password. This feature allows users to efficiently monitor and engage with projects they are interested in by providing timely updates about relevant activities.