When you're logged in you'll see that the actual link for questions is a shortened version.
On this question, it looks like this:
http://meta.superuser.com/q/1486/307
Grab and post that link to other sites and when you hit the necessary levels of referrals, you'll get your badges. The referral ID is your UserId.
You don't have to be logged in to get that link. Just know your user ID (it's the first number on your profile URI) and swap out the question ID.
Basic format of the link you'll want to share if you want that Announcer/Booster/Publicist badge.
http://superuser.com/q/[QuestionId]/[UserId]
Here's another example:
http://superuser.com/q/2/5003
Sidenote:
- You can't get Booster until you've already gotten Announcer.
- You can't get Publicist unless you've already gotten Booster.
- You can't get these badges for the same question.
- Only applies to questions, doesn't work for answers.
- Does not come with fur coat, cane or fedora.