Merchandise has become an increasingly important revenue stream for these top digital stars, almost all of whom (No. 1 being a notable exception) are in their 20s and 30s. Each of the 10 on our list now has a line of merchandise, whose blossoming sales help account for that 42% income increase from a year ago. “I’ve built this huge community, and we’ve made a lot of people laugh,” says Fischbach, who sees Cloak as the first step toward an empire built on assets more tangible than video uploads. For now, though, all those gaming clips serve as a force multiplier for the man known as Markiplier. Like any savvy businessman, he’s thinking ahead. “I’m not going to be able to make videos on YouTube forever,” he says. “I need to plan for the future.” 
This year, Heather Hund and her family will gather in West Texas on December 25 and solidify a new Christmas tradition, in which each relative is randomly assigned to give a gift to another family member and to a house pet. “The rules are basically a regift for the human and then $10 for the pet,” Hund told me. “And my 18-month-old son got put in [the latter] category too, so it’s small humans and small animals.”
YouTube allows users to upload, view, rate, share, add to favorites, report, comment on videos, and subscribe to other users. It offers a wide variety of user-generated and corporate media videos. Available content includes video clips, TV show clips, music videos, short and documentary films, audio recordings, movie trailers, live streams, and other content such as video blogging, short original videos, and educational videos. Most of the content on YouTube is uploaded by individuals, but media corporations including CBS, the BBC, Vevo, and Hulu offer some of their material via YouTube as part of the YouTube partnership program. Unregistered users can only watch videos on the site, while registered users are permitted to upload an unlimited number of videos and add comments to videos. Videos deemed potentially inappropriate are available only to registered users affirming themselves to be at least 18 years old.
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