Stack user can view another profile and enter a view where they can clone, drag+drop in side by side view, follow user, or share that user's stacks to another stack user.

By following another user, your 'follow stack' is naturally curated by that stack owner and you benefit from it. Say someone has curated a great list of NY eats under $20. Just follow that stack or import it and make it your own.. Maybe a bit like how Github works but with links instead of code.

When someone follows, clones, or shares your stacks/lists, an email event fires off to notify both parties.