100 million people. According to Amazon CEO Jeff Bezos' annual letter to shareholders, that's how many subscribers pay for Amazon Prime, the tech giant's bundled offering of free shipping, exclusive video content and other perks. In the world of streaming video, that number also means that Amazon is now officially the second-largest streaming video company in terms of subscribers.

Discovery is figuring out how to embrace streaming video. For starters, the company is beginning to license its channels to "skinny bundles" like Philo TV. Philo, and competitors like Sling TV and YouTube TV, offering streaming bundles of cable channels at more affordable prices than the traditional cable or satellite bundle.

This week is shaping up to be an important one for the world of streaming video as two services launch, each seeking to chart a new course for live sports.

HQ, which until this point has not had ads or sponsors, last week turned on the advertising spigot. Just as the show tries to turn an app into a nightly event, the company's monetization strategy is similarly event-driven.

Under the terms of the agreement, TiVo's linear TV viewership data-which includes more than two million households-will now be available in Tru Optik's OTT Marketing Cloud platform.

Last week the rapper Drake logged on to the Amazon-owned videogame streaming site Twitch to play "Fortnite" with one of the platform's most-popular gamers, a man named Ninja. The duo drew viewership that many cable channels might well envy, with 628,000 concurrent viewers. The surprise gaming session was also a proof of concept: with viewership heavily focused on hard-to-reach young male consumers, esports is a prime opportunity for content creators and marketers.

Sling has tapped The Martin Agency as agency of record, leading marketing strategy, creative development and production efforts for the streaming service.

It's still early in the game, but the company's potential in the video business is becoming clearer every day. While Netflix is focused on on-demand entertainment content, and Facebook and Snapchat prioritize both slickly produced evergreen and amateur content, Twitter has focused its video ambitions on live, premium video. "Live" is the key word here.

Among the few ubiquitous TV show formats is the home renovation genre, which helped define HGTV, and is now commonplace on a slew of traditional cable channels like DIY Network and FYI. So it was surprising to Candis and Andy Meredith-who hosted the series "Old Home Love" for HGTV and DIY Network-when they discovered that the genre was largely absent on digital and social platforms.

Four years ago, the WWE wrestling league launched a curious new product: WWE Network. The network was streamed over-the-top to consumers, featuring all the company's pay-per-view events live. It was a bold move, and a disruptive one.