Facebook user id why we need it
facebook user id in most case used for websites to tell facebook that you are the owner of that website . and with that rule you can control your facebook comments ...
How to get your facebook user id method 1
in google chrome near url https://www.facebook.com/ there is lock button click over it you will see notification , certificates , cookies and sites setting .
Get facebook user id from browser cookies
Press over cookies you will find facebook.com and www.facebook.com click over facebook.com then click cookies then you will find c_user we are done . there is your user id .
How to get your facebook user id method 2
the second method is also easy you can get your facebook user id from facebook source code .
Open facebook source code
Search for facebook user id
press ctrl F a little popup will show up write user_id and there it is your user id .
How insert your facebook id in your website
before body and inside <head></head> write <meta content="100000000000000" property="fb:admins"> you have to change 100000000000000 with your facebook user id , now how to know your id ?