Parked Domain Girl

Those who, like me, frequented the early-21st-century Internet will instantly recognize this girl, who appeared daily seemingly at random.

From Know Your Meme: "Dead/Expired Domain Girl or eNom Girl refers to this stock photo of a girl with a backpack that achieved viral status after being used as a placeholder image for ads plastered on multiple squatted/parked domains from 2005 (?) to 2012."

More:

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Origin

On August 6, 2005, Dustin Steller uploaded a photo of his sister, Hannah Steller, to IStockPhoto. Demand Media Inc. bought the license for the stock photo and used the image as a placeholder for empty "squatted/parked" websites, placed alongside link ads. The goal of the websites was to earn ad revenues from accidental clicks and misspelled URLs.

Spread

The stock image attained viral status, as it was shown whenever you visited an incorrect URL or expired domain. On August 25, 2008, the now defunct website YouSuckAtWebsite.com posted the article "The Most Infamous Girl in the History of the Internet" in the hope of identifying the girl in the stock photo. Dustin Steller himself commented on the article and confirmed the her identity.

The stock image continued to be used on parked domains until 2012, when Enom, Inc., the domain registrar under Demand Media that managed its websites, decided to retire the backpack girl from future usage.