The concept behind the Reply Girls phenomenon is a simple one. If you reply to a video on YouTube, your clip will be displayed in the recommendation bar.
If it's a viral video, you will get millions of views. If you get millions of views, advertisers will start to notice you.
Girls that capitalize on the high view counts are usually fairly attractive, and have to be willing to do hours and hours of research in order to find just the right videos.
They usually wear extremely low-cut tops while discussing them.
This clip documents the life of one of the most popular Reply Girls. Her first paycheck was only good for paying that month's phone bill, she says.
Now, she makes more money than she ever thought she would.