Audiences are group of people who are gather together to listen to something.
Individual is only one person communicating to each other. For an example: Text are apps that only one person can communicating each other.
Group is a number of people who are gathered together, Group can be like a friend group or a family group. For an example: Zoom, Email, Discord and Whereby are apps that people can make a friend group to communicate with each other.
Everyone is every person in the world. There are a lot of apps that everyone can see. For an example: Tiktok, Instagram, Blogger, and Snapchat are apps that everyone can communicate with each other.
Different apps has different audiences.