Whether you follow the Kardashians or not, one thing’s for sure. They have lots of influence.  And with just one tweet on Wednesday, the youngest of the Kardashian clan, Kylie Jenner, single-handedly sent Snapchat shares plummeting. But what on earth did she say that affected Snapchat market value?

Kylie Jenner was the first of her celebrity family to open a Snapchat account, and in true millennial style, she referred to this social media platform as her “first love.”

But now, Kylie is calling it quits and moving on. She said in Wednesday’s tweet (@KylieJenner), “sooo does anyone else not open Snapchat anymore? Or is it just me… ugh this is so sad.”

It seemed like a harmless tweet, and if it came from anyone else, it might have been. But within the next 24 hours, stock market analysts watched as Snapchat market value dropped by 6.1 percent – or, $1.3 billion.

Kylie’s influence on the market also reminds us of just how powerful celebrities can be in our own decisions. This goes for everything from social media apps to fashion, cosmetics and lifestyle choices.

In short, Kylie is setting the rules for what’s cool and what’s not, and people are following suit.

Kylie’s decision to drop Snapchat may be due to the new changes they introduced – changes that frustrated millions of other users, too. In fact, 1.2 million signatures were gathered in a petition asking Snapchat to roll back the changes.

Perhaps Kylie Jenner’s tweet was that final signature needed to send Snapchat a very clear message: users aren’t too happy with the app.