#BBCtrending: How two friends sparked a hashtag race row

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How did two friends from Florida start a US-wide race debate on Twitter?

Daniel Brack, who is white, and Josh Prickett, who is black, started tweeting each other using the hashtags, #IfIWasWhite and #IfIWasBlack. It started with jokes at each other's expense but to their surprise, it kick-started a heated discussion on race across the US.

#BBCtrending investigates.

Produced by Benjamin Zand.

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