The new factual entertainment series will see a number of contestants living together - but never actually meeting in person.
Instead, they'll interact solely via social media, competing for a £50,000 prize given to the most popular contestant.
The programme comes from Studio Lambert, makers of the hugely popular Gogglebox.
They are looking for interesting individuals with strong opinions from all walks of life to apply now.
You must be at least 18, have the right to live and work in the UK and be free for filming later in 2018.
To apply online click here or email thecircle [at] studiolambert.com
Announcing the show earlier this year, Channel 4 said The Circle "will ask provocative questions about modern identity, how we portray ourselves and how we communicate through social media."
They tease: "Our social circles used to consist of a handful of friends we saw regularly, now it can be made up of hundreds of individuals many of whom we have never met in real life.
"Social media has radically changed the way we make friends, conduct relationships, argue and even fall in love, but how truthful are our internet identities? And what are we prepared to do to be popular, when others can’t see who we really are?"
Contestants will live together in a block but in separate individual apartments, interacting with one another exclusively through a bespoke voice-activated social media platform called The Circle.
Channel 4 explaind: "The Circle will enable them to chat, make friends, argue and maybe even fall in love. Building their own profiles, contestants will only get to know each other from what they choose to reveal via The Circle.
"They will be able to communicate as a group or individually, allowing cliques to form and private allegiances to be made."
The contest will see the contestants rate one another and the least liked faces being 'blocked' and removed from The Circle.