A solitary tweet by one of the Kardashians is believed to have been enough to drop stocks in one of the world's most popular phone apps by more than 7 percent.
Kylie Jenner - reality TV star, makeup mogul and new mother - posted a disparaging tweet about photo-sharing app Snapchat on Wednesday (NZ time).
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"Sooo does anyone else not open Snapchat anymore? Or is it just me... ugh this is so sad," she wrote.
She then wrote a follow-up post, claiming Snapchat was her "first love" - but the damage was already done.
The post on Twitter, another struggling social media platform, appears to have initiated a massive downturn in stock value for Snapchat.
At the time of the post, the share price was sitting at US$19.02 - but by the same time the following day, it had dropped to US$17.14. It's now risen again slightly to US$17.51.
The drop, which represents a stock value collapse of more than 7 percent, is a marker of just how influential Jenner and her wider family has become.
Jenner is the eighth-most followed person on Instagram, and her first baby post is the single most liked photo ever posted to the platform. Her Instagram audience is the second-biggest in her hugely popular family, behind half-sister Kim Kardashian.
Snapchat's stock value has now plateaued, though it is now worth a whopping US$10 less than what it was a year ago.
The platform has faced criticism in recent times after a highly unpopular update that users slammed as impractical.