I have a similar take to wolfgang's. I feel like in subjective reality, our consciousness really represents everything. The trees, the rocks, you, me, etc. However, our thoughts and ego and what we believe is to be our identity or self is merely a projection from consciousness. Thus, in subjective reality, you are the only consciousness because you are part of that all encompassing consciousness. So when you talk to others, you are talking to yourself. There is no difference because everything is part of that one consciousness.
HOWEVER, once you start seeing other people as separate from you and think "I" am the only real person, then that thought and belief is just a projection of the real all-encompassing consciousness. It's like a paradox. Consciousness is all there is. There is no I, you, me, them. Thus, the bright side is that we are all indeed connected by this one consciousness. So even though talking to other people might be simply talking to a part of yourself (since you're that all-encompassing consciousness), you're still talking to a different part of yourself and that is what makes it interesting and fun. That's my take on it