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+# Authentication guide - Twitter
+
+*Note:* This guide was written before the renaming. Just replace `HackMD` with `HedgeDoc` in your mind :smile: thanks!
+
+1. Sign-in or sign-up for a Twitter account
+
+2. Go to the Twitter Application management page [here](https://apps.twitter.com/)
+
+3. Click on the **Create New App** button to create a new Twitter app:  
+   ![create-twitter-app](../../images/auth/create-twitter-app.png)
+
+4. Fill out the create application form, check the developer agreement box, and click **Create Your Twitter Application**  
+   ![register-twitter-application](../../images/auth/register-twitter-application.png)
+
+   *Note:* you may have to register your phone number with Twitter to create a Twitter application
+
+   To do this Click your profile icon --> Settings and privacy --> Mobile  --> Select Country/region --> Enter phone number --> Click Continue
+
+5. After you receive confirmation that the Twitter application was created, click **Keys and Access Tokens**  
+   ![twitter-app-confirmation](../../images/auth/twitter-app-confirmation.png)
+
+6. Obtain your Twitter Consumer Key and Consumer Secret  
+   ![twitter-app-keys](../../images/auth/twitter-app-keys.png)
+
+7. Add your Consumer Key and Consumer Secret to your `config.json` file or pass them as environment variables:
+  - `config.json`:
+    ```javascript
+    {
+      "production": {
+        "twitter": {
+          "consumerKey": "esTCJFXXXXXXXXXXXXXXXXXXX",
+          "consumerSecret": "zpCs4tU86pRVXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX"
+        }
+      }
+    }
+    ```
+
+  - environment variables:
+    ```sh
+    CMD_TWITTER_CONSUMERKEY=esTCJFXXXXXXXXXXXXXXXXXXX
+    CMD_TWITTER_CONSUMERSECRET=zpCs4tU86pRVXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
+    ```