The workplace messaging app's sale comes as the pandemic has increased the focus on remote work.
The Californian firm is launching its chip at a time of trade tensions between the US and China.
They include the removal of images of female breasts in a post about breast cancer.
The digital currency has traded as high as $19,920.53, beating a record set in December 2017.
Zoe Kleinman looks at the sneaky way some sellers are trying to boost their products on Amazon.
Staff watched and labelled films and series, then fed the data to an algorithm to generate an age rating.
The streaming giant reveals what its 320 million global listeners have been playing this year.