I think the immersion is a good point, but I agree with Adam. And it's true regarding the mobile too: IMVU has 10+ million downloads on Adroid, Roblox 100+ millions! I don't know on iOS, but they should be further many downloads. However, I wonder if an optional icon that tells who is running Sinespace in first person view could help? Maybe next to the avatar name. Maybe optional.
Talking about first person view and immersion, in Sinespace it would be nice if my avatar could be visible to me, when I zoom up to first person view.

To understand what I mean, on Second Life / Firestorm, you have an option that makes your own avatar visible when you go in "mouselook" first person view. Then if your avatar follows your point of view, as you turn the cam by holding the right mouse button down, that would be even better IMHO. I think at it as an option, so who likes it, enables it, else turns it off / leaves it disabled.