I am trying to design an application where users can make posts with Django on the backend. Right now I have to refresh the page with JavaScript every 20 or 30 seconds to check for new posts that might be available for that page. I was wondering if there are  more effective ways to do this? Maybe with a JSON response? I am looking for a solution like Twitter, where they show how many new posts are available that are not on the page or even like on Facebook where they update the wall posts automatically.Is there a particular technology should I be researching in order make the updates more efficient? 
How to dynamically add new posts once they are created
javascript;jquery;django;websockets