When adding a Facebook Page Service, you can also set up geo-targeting settings so that only people that have a certain location or language selected on their profile can view the posts sent using that service. If these settings have not been added correctly however, the social network will be unable to process the post which will lead to it being rejected with the following error message:
(#100) Invalid targeting:
Facebook only allows you set geo-targeting up as follows:
1. Multiple countries only.
2. One country with multiple regions only, no specific cities.
3. One country with one region and multiple cities.
4. One language.
If you are receiving this error message, could you please look to edit the settings for the Facebook Service as follows:
1. Select Services.
2. Click on ‘My Services’ (below the list to the left).
3. Locate the Facebook service and click the edit icon.