1) How much exercise does your dog need?
My dog needs a moderate amount I saw. He pretty much gets his daily activity needs by his daily walks, and in the evening while I'm watching TV, he likes to bring toys to me and I will just throw them down the hallway for him to fetch and bring back.
2) How independant is s/he? Does s/he show interest in other humans outside your immediate circle? Does s/he like to remain with you at all times?
This depends on his moods and where we are at. My dog definitely LOVES human companionship. If I have friends over, he will get excited at first when they come and want to sit/play by them. Eventually, he'll just be fascinated and watch us interact.
If we are at a dog play group, he will run around and play with the other dogs, and also go to the other humans and sit on their laps and want to be pet by them.
If he is scared, or unsure about the environment, at that point he will stay by me, but this is really rare for him.
**3) Does your dog have other doggie playmates?
Yes my dog has other dog playmates. He loves all dogs, it is just that not all dogs like him sometimes 
I have seen many yorkies exhibit a variety of behaviors. It all just depends on the dogs personality, how s/he was raised, and so on. There are just so many factors that can play....