Aspiring stars in Los Angeles used to measure success by the number of parts or auditions they snared.
Travel vloggers Damon Dominique and Joanna Franco do it by brewing a pot of coffee in the morning, opening their laptops and counting the number of new comments, mentions and likes they tallied.
The duo, known online as Damon and Jo, have attracted advertisers by amassing more than 210,000 subscribers on YouTube. That's enough of a following to hopefully never have to walk dogs or deliver groceries again.
But maintaining that momentum won't be easy. It takes a relentless pace of new content and round-the-clock...