In the case of disputes, problems, queries or clawedback funds, they'd need some sort of contact method and more than just a single email address.
You can do something slick with an advertisement if you have the budget, or failing that, just add the link to your Instagram profile and focus on posting really interesting things so people will want to learn more about you.
Time to get this lesson started.
And lets not get into the whole privacy issue of if you have all the admin on the receivers account.
Your unique Amazon product number.
On this menu look to the left side under the title Your List.
Amazon's own still don't mention anything about inviting users or collaborating on lists, so this feature does indeed seem to be new.