Realtime connectivity is crucial for digital publishers to keep readers engaged and enhance user experience through live features such as live commenting. Live commenting can be made available using either a push or polling data approach. Facebook's "write locally, read globally" solution allows efficient real-time updates by storing information about the content piece that a user is currently viewing in their local data center and fetching viewer info once a new comment has been published across various data centers. Real-time communication platforms like Snapchat have brought a sense of urgency to reacting to specific content within a certain timeframe, setting high expectations for real-time experiences. To add live commenting features to applications, organizations can use real-time data delivery platforms like Ably and follow tutorials on building real-time commenting systems with React.