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Eggheads have found a positive link between the number of racist tweets and the number of racist hate crimes in US cities

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Depends entirely on what you mean by "causal relationship".

You can easily construct the hypothesis that nice weather causes increses in both, and that there is a common cause between the two things. You could then do further studies to test this hyposthesis.

A better example would be the correlation between the decline in pirates and global warming.

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