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Facebook comments Spam Bypass

Facebook comments doesn't allow you to post same comment all the type and this is the story how I bypassed this spam protection.
It was very hot afternoon and I was scrolling the news feed of my Facebook News Feed which is flooded by the posts of the actors and others. 

I was continuously posting the video URL of YouTube.
Actress and Other Facebook Pages  allow commenting. So when I was commenting the same URL on lot of posts including the actors.

Suddenly there was a pop up that was shown saying

You can't post at this time and it was going against our terms of service.

So I thought in my mind I need to bypass this.
I just posted another URL of the video. Now it allowed me to post !!!

What a surprise!! It allowed me to post a different URL.

I was curious to know why it happened and next I posted the previous URL that I was posting continuosly once again. Again there was an alert popup saying the same message about spam.

If you are aware about the Linkshim that facebook uses. 

If you click on any URL that is shared as a link on FB. then you may notice in the next tab that opens up something like this... https://l.facebook.com?redirect=<URL_you_wanted_to_visit>.

The use of of this linkshim is it will not allow you to visit evil websites.
So, i think you know what I will be doing next.

I used the linkshim URL of the video that was unable to post continuously.
and there I go . 

It worked!! 
I reported it to Facebook and they said and it wasn't a big issue because any one could use a redirect link to the Video's URL instead of linkshim.

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