You might want to consider this article. It pretty much says Yorkies have a TON of energy, but that does not necessarily mean they need hours of exercise. I'm not really sure why not, because I give the dog I might adopt hours of exercise everyday. I walk him three times a day, totalling over 2 hours.
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He LOVES people and dogs. At the dog park it was hard for him to choose between people and dogs, but since he is not neutered that really has an effect. He sniffs the dog all day, rather than playing chase all the time. When it's only one dog he usually plays chase. He likes to be with me all the time, except when at the park, where he goes around peeing and sniffing everything.