Some prominent people also chimed in, with British comedian James Corden writing on Twitter, "I'm a Laurel. You will not silence us," and US comedian and talk show host Ellen DeGeneres writing, "Literally everything at my show just stopped to see if people hear Laurel or Yanny. I hear Laurel."
Some users said the discrepancy was caused by how different people hear different frequencies.
One user posted edited versions of the recording to show how it changed depending on the pitch.
Reminiscent of '#Thedress'
The outcry echoes the shrill debate surrounding "#Thedress" that erupted in early 2015. Millions of people argued over whether a photograph of a dress showed a black and blue or a white and gold one.
The optical illusion was never solved. Although it's not clear why not. The dress was clearly black and blue.