The 22-year-old received a text as soon as Chloe chose to couple up with Shannon’s partner Aaron.
She said: "Oh my god, I’ve been dumped.”
The model from Fife then read out the text: "Shannon you are now single and have been dumped from the island, please pack your bags and say bye.”
Shannon was a hugely popular contestant on this year’s show – with many calling her the ‘it girl’ of the series.
Looking tearful when speaking to the cameras after being dumped, she said: “It is what it is.”
The news sent Twitter into meltdown.
Former Love Island winner Amber Gill Tweeted: “Why is Shannon gone I HATE THIS.”
Writer Jason Okundaye said: “If there’s no secret villa that Shannon is waiting at I’m tempted to stop watching, I think that’s unacceptable and from a perspective of contestant welfare it doesn’t feel worth it to have played her like that."
And Geordie Shore star Holly Hagan wrote: “I just think there’s better ways to spice up the show than booting someone off after one day. Massively unfair the poor girl’s spent more time preparing and quarantining than she did in the villa.”
It comes after Aaron chose to couple up with Shannon on the first day – ignoring two other girls who stepped forward for him and the fact Shannon did not.
Another Twitter user wrote: "Shannon being gone is all Aaron's fault, he picked a girl who he knew didn't even want him...”
Others have been speculating Shannon could be sent back into the villa as a bombshell or make a dramatic return in Casa Amor.
Love Island is on ITV2 and ITV Hub from 9pm each night.