For making sure your job ads on LinkedIn, XING and Facebook can be assigned to your company profile there, it is necessary to insert links to the respective profiles in your JOIN Account.
You just need to follow these Steps:
Inserting the links of your respective company profiles and thus connecting them to JOIN ensures that your job ad generates even more candidates.
For connecting Facebook to your JOIN Account properly, please follow the steps in this FAQ post about the settings you need to set within Facebook.
Connecting external company profiles to JOIN