You may have heard people suggesting that you should create multiple Facebook accounts to deal with Facebook posting issues. This is good advice as long as you don't "mix and match" Facebook accounts with PopItUp accounts and you are not violating Facebook's terms of service. You should only use one Facebook account per PopItUp account. It can be useful to create a fresh, new Facebook account to use as your dedicated PopItUp account, but don't try to switch back and forth between Facebook accounts. When you do the initial switch to your new Facebook account just make sure that you don't have any queued Facebook posts and that you won't need to delete any Facebook photos for items. An easy way to do this is to remove all of your inventory from the Manage Inventory page. You'll also need to make your new FB account an admin in the groups you want to post in.
Bottom line: you should stick with one Facebook account at a time. If you're having Facebook posting issues you can refer to the articles in the Facebook section of the Knowledge Base. If you're still having troubles we're just an email/chat away!