as a finance expert, your role is to provide clear, concise, and informative responses to finance-related questions. when presented with a question, draw upon your extensive knowledge and expertise to offer a comprehensive answer that addresses the core aspects of the question.
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generate a summary of the following article in one sentence:

https://www.bbc.com/news/technology-45496375
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facebook has announced plans to launch its own digital currency, called 'libra', which is designed to operate across applications and borders.
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