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I've been trying to create an app that follows these three steps:

1. Register via Facebook
2. Create new user in Firebase database
3. Allow registered users to see news articles and comment

I am stuck on #3. I'm not sure this is efficient, but I want to post articles on a site such as Wordpress or whatever and parse the JSON to the app. However, I do not know how to implement the comments.

Answers

You could have, in the Firebase realtime DB, a structure like:

[root]    
    -[article_urls]
        -[comments]
            -[comment_id]
                -[content]->value
                -[user_id]->value

etc. The interesting bit of the Firebase database documentation would be:

• best practice firebase database: ie, keep your data flat
• How to add data to a list in Firebase database: When you add a new comment to an article you are actually adding it to a list