Real-time data is no longer a luxury, but neccessity for making the user feel engaged and in control. Here are some examples of how you can use it on your own site.
1. Locations and maps
Companies like Uber and FlightRadar are using using real-time data for live maps.
Google Docs and Teamweek are using real-time data to allow multiple users work on a single document or workspace at the same time.
Whether it's Skype, Slack or Whatsapp they all use real-time data to send instant messages.
4. Timelines and Activity Streams
Twitter, Facebook and other social media sites use real-time data to keep user timelines up to date.
Sites like Facebook and Booking.com are using real-time notifications to engage users.
6. Timed advertising
Sport sites use push messaging to to show advertising during sport match halftimes.