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Such a crazy event never happened in the world of social slots on Facebook!

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"This kind of crazy event...."  I agree with Tony about "social slots" - it's not a phrase used by native speakers and so the meaning would be unclear. I'm not really sure what it means.

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One way to say it better is: Such a crazy event has never happened before in the world of social slots on Facebook!

But "in the world of social slots" sounds a bit strange too.

I would rephrase it like:  Such a crazy thing has never happened before on Facebook.

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