If any company can take a cryptocurrency mainstream, it is Facebook.

More than 2 billion people log into its family of apps and increasingly they want to buy things and send each other money.

Facebook's answer, according to several people familiar with its secretive "Libra" project, will be to try to launch a "stablecoin", a digital currency pegged to the dollar.

If successful, the Facebook coin could not only allow payments and transfers within the Facebook empire, but could also be stored on digital wallets and spent in shops, or exchanged into traditional currencies.

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"Facebook has all the prospects to

Following in footsteps of WeChat

Advertising and ecommerce blend together

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Technology and regulation hurdles

Project needs partners