Polyamory

So I was having thoughts recently about the idea of soul mates. Some questions came to mind and I thought I'd put them to you folks and try to answer and gather my own ideas on the matter.

1. What is a soul mate?
2. Does being poly mean that there are no soul mates or does it just alter the definition as we alter the definition of relationships?
3. Are we limited to only one soul mate?
4. Does a soul mate have to be romantic/sexual or can it be platonic?

I think I'll wait to put my $.02 up until some others have commented. I'm still trying to figure out what I truly think after all.