Adding other Social Media

You mean to the company section? See https://wpjobmanager.com/document/editing-job-submission-fields/ for a guide on using the filters to add new fields.

Remi Corson also made this https://www.remicorson.com/product/wp-job-manager-custom-fields/?ref=1 which can edit the fields via a UI.

Oh wonderful ill take a look!