If you are approved for sending files up to GB5, make sure that you are connected to the JUMBOmail system when sending the files.
If you did not receive such an email, you may have skipped one of the steps in the process.
The members you invited may not have registered to the site via the link they received from the JUMBOmail system and so you have not yet received the benefit that your post is not shared on Facebook, etc.
You can find out where the GB5 campaign process is located through customer service