Each dream has its own setting for who can see it.
Only me / Mutual follows only / Everyone. The default is "Only me" — nothing is shared unless you choose to share it.
On a shared dream, people can send "♡ Cheer" and "✋ I can help". The owner can see who did.
"Share outside AlohaD" creates a page anyone with the link can open, ready to post on a social network.