There are two ways by which we can create Chatter Free or Chatter External Users. They are –

  • Administrator can create a new user record and select Chatter Free or Chatter External from User License picklist like –
  • Administrator can enable Chatter settings –
    • Coworker Invitations – For users to invite coworkers as Chatter Free Users.
    • Customer Invitations – For inviting customers as Chatter External Users.

P.S. Users can accept an invitation to join chatter within 30 days.