Twitter showed a yearly profit in fiscal $2018$ and $2019.$

$($Click to select$)$

Operating income had shown a steady improvement over the past years, and in $2017,$ Twitter had a small positive operating income for the first time.

$($Click to select$)$

Research and development, and sales and marketing showed large increases in $2019.$

$($Click to select$)$

The five$-$year increase in