YouTube is testing a direct messaging feature in its mobile app, allowing users to share videos and engage in conversations. This feature, which was removed in 2019, is currently being trialed for users over 18 in Poland and Ireland. Users can share long-form content, Shorts, and live streams through direct messages, with options to accept or decline chat invitations from other users. All communications will adhere to YouTube's Community Guidelines, and users can block unwanted messages. Notifications for new messages will be integrated with other alerts.