Single Player vs. Multi - any storyline differences?

[Kevin]

In Diablo 1, there were some quests and NPCs that didn't appear when playing multiplayer. I don't remember if D2 was the same.

So I'm wondering: Does anyone know if there are any storyline differences between single- and multi-player in D3? I plan to play multi exclusively, but I don't want to miss any storyline.

There is no single player in D3. The best you can do is a private game, but it's still online, and the only difference is that no one else can join it.