Q: If a visitor sees a Nugget, can I show them a different one while they're still on my site?
A: If you have multiple Campaigns running live on your site, a visitor will only see one Campaign per browsing session. If you want them to see another Nugget before they leave your site, you can set up multi-step followup, with the delay set to "Same session."
For example, if someone converts on your Newsletter sign-up, you can show them a Facebook "Like My Page" Nugget when they go to leave your site, and grab that Like while they're feeling good about your business.