Shares of Roku jumped more than 6% on Friday after the video streaming company posted fourth-quarter results that trounced analysts' expectations and offered strong guidance.Here's how the company did based on analysts' estimates compiled by LSEG: Earnings per share: 53 cents adjusted vs. 28 centsRevenue: $1.39 billion vs. $1.35 billion"The biggest driver of our subscriptions business is just the secular trend of more and more services moving into a service like premium subscriptions instead of just doing t ...