Create a new task if there are no active tasks with this contact
From Planfix
The setting integrating messengers and social media lets you make it so that a new task is created if there is no active task (with any active status) for communication from a client:
By default, this checkbox is checked. When the checkbox is checked, a new task will be created if the previous task with this client has been deleted or completed, or is inactive. Conversation history will automatically be added to the description of the task created: