Assuming that you followed the directions and placed the correct IDs in for each service, then "Set" means that the ID is in our system. Google is more tightly integrated through their APIs and they give us more statuses. The others don't support the same type of integration so it's up to authors to place the IDs. In these situations we don't know that they placed in the right ID, but we can tell you that we have a value for the field. I hope this helps.