Where do I find the Facebook app ID?

In order to use most of the Facebook features for apps, like Facebook Analytics and Facebook Audience Network Ads, you will need to create a Facebook App ID

1. The first step is to log in to your regular Facebook account, you can do so clicking here)
2. After logging in, you can go to the Facebook for Developers website and you should now be already logged in to your own developer account
3. To create your Facebook App, go to the top navigation bar of Facebook for Developers site select Add a New App
   
   

   To begin, click on “Add a New App” link under the “My Apps” menu in the top right corner.

   Step Two: Input Your New App’s Information

   Once you’ve clicked “Add a New App” link, a pop-up box will appear asking you for your new App’s Display Name, Contact E-Mail Address. Enter App’s Display Name and click on “Create App ID”.

   
   

   Step Three: Add Products In Your App

   Now you have to add “Facebook Login” product in your app. And to do that click on “Set Up” button.

   
   

   After clicking on “Set Up” button you will redirect to the “Quickstart” page.

   To get started, select the platform for this app. Now select “Web” platform for this app.

   
   

   Check Magento 2 Facebook Pixel to integrate analytics tool into your Magento Store.

   Step Four: Set Up Your Product

   After clicking on “Web” a new tab will be open. Now enter your site URL here and click “Save” button.

   
   

   After clicking on “Save” button skip the remaining part. Now click on “Settings” in left side menu list.

   Enter redirect URL here ( for example “https://your-domain/auth_oauth/signin” in case of our website ajax login/sign-up module) and after that click “Save Changes” button to save the details.

   
   

   Find the links below for your Facebook Messenger-

   Magento 2, WooCommerce, Opencart.

   Step Five: Make Your App Live

   For making your app live you have to enter some more details. And for doing this click on “Basic” tab under the “Settings” in the left side menu list.

   After clicking on “Basic” tab you have to enter “App Domains” and “Privacy Policy URL” and make this app live by clicking switch button on top.

   Peter's post is pretty much spot on, but if you want to learn how to navigate to it yourself here are the instructions:

   On the left hand menu, you need to click "more", then you'll see "Developer", click on it. Afterwards you'll be presented with a page where your apps are listed under "My Applications" click on "See my applications". You can find all your API Key, secrets, and IDs there.

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   This wikiHow teaches you how to create a new App ID on the Facebook for Developers page in order to integrate Facebook into your app or website.

   Steps

   1. Click the My Apps tab. It's in the gray bar running along the top of the page. This displays all of your apps.

   1. If you've already integrated Facebook into your app, you will see it here. Scroll down to browse the list or use the Search field at the top to quickly find an app.

   1. Note down the App ID. You will see the 15-digit App ID right below the app's name. This number is unique to your app. You will need your unique App ID when you're using analytics, or creating ads in the Audience Network.

   1. Click Create App to add a new app to Facebook for Developers. You can now add your new app to receive your new ID. Fill out the form, and click Create App ID once prompted to display your new 15-digit app ID.