500 Internal Server Error
The 500 Internal Server Error is a very general HTTP status code that means something has gone wrong on the web site’s server, but the server could not be more specific on what the exact problem is.
Facebook Server Error !
If you try to write a number in Facebook hashtag URL you will see an internal error !
For Example : https://www.facebook.com/hashtag/2016
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Programmer Yassir Taqatqa