This option will be enabled if “Social Feature inbuilt module of ARMember is activated.”
This Feature is not related to Social Signin/Connect. This will provide fields for signup forms and Edit Profile forms.
When you enable Social Feature add-on, you will find one option in Registration/Signup from Editor shown in following image.
You will find following social profile fields options which can be directly added to your registration/signup form.
The fields you have added to signup form will be available in Edit Profile Fields. Even more these social profile fields are provided with editor shortcode support. You can select and add those fields from Edit Profile Shortcode as well.
Note: If your Signup Form is not having Social Profile fields but you have added it from Edit Profile Shortcode then it will display those social profile fields in Edit Profile form.