While few people older than 30 probably know who Jenna Marbles is, her popularity is unquestioned among teenage girls who live on the Internet. She has more Facebook fans than Jennifer Lawrence, more Twitter followers than Fox News and more Instagram friends than Oprah. Her weekly videos on topics as quotidian as “What Girls Do in the Bathroom in the Morning,” “My Favorite Dance Moves” and “I Hate Being a Grown Up,” place her in an elite club of more than one billion YouTube views, with more than eight million subscribers and growing.

“My perspective is to think, ‘I just have a lot of Internet friends,’ ” said Jenna Marbles, 26, whose real name is Jenna Mourey (Marbles is the name of her Chihuahua). She acknowledges it is an odd kind of celebrity. She is a D.I.Y. digital entertainer who conceives of, stars in, shoots, edits and uploads her own videos — often in a single day.

Her videos are a highly shareable cocktail of comedy, sex appeal, puppies and social commentary, laced with profanity. She skillfully juggles Facebook, Twitter, Instagram and YouTube to build a deeply loyal connection with fans who find her eminently easy to relate to.

The result is more than a million views every single day and more money than she had ever seen before in her life. She may be unique, but she is no viral-video fluke. To a younger generation who spends more time on YouTube than TV, Jenna Marbles already embodies the future of celebrity.

Internet fame can come on fast. In the summer of 2010, Ms. Mourey shared a three-bedroom apartment in Cambridge, Mass., where her $800 rent was scrounged together from a patchwork of part-time gigs: bartending, blogging, go-go dancing at nightclubs and working at a tanning salon, where she remembers the singularly depressing chore of mopping up customers’ sweat. Meanwhile, her newly completed master’s degree in sports psychology gathered dust.