Many Facebook Applications need Facebook Page ID and Profile ID or Admin ID. If you are using a custom username for your Facebook profile or page,e.g facebook.com/PixelInsert then unique ID will not appear. Facebook social plugins require this unique ID
1. Facebook Graph API
Facebook Graph API help detecting Facebook Page/Profile/Admin ID from your Facebook username
https://graph.facebook.com/yourusername
You will get the following details in JSON format. Here you can find the ID in the first line.
![FB Page ID](https://pixert.com/blog/wp-content/uploads/2011/12/fbpageid-300x67.gif)
2. Facebook URL address
You’ll see the unique ID at the end of your facebook URL address if you don’t setup facebook username
http://www.facebook.com/profile.php?id={YOU_FACEBOOK_ID}