I've had this theory for a long time. That nobody's world is ever bigger than 5 people. 6 degrees of separation probably works off a similar idea. Your 5 people change throughout your life obviously, and sometimes even on a day to day basis, but these are the people closest to you, the ones you tell all your secrets, the ones who if they ever got together, would probably know everything there is to know about you, the ones who support you and keep you going.
When you're a child, your parents are two of them, as you grow up, it becomes friends from school, later your boss, or a partner of some sort might feature. Some of them will be there for a day, and then disappear off again for a few months, some are more or less permenant fixtures.
Currently my world consists of the boyfriend - Chris, a friend named Joel, one of his boys called Seany, another friend called Lisa, and my best and oldest friend called Jamie, who has his birthday sometime around now.
Think of a friend you know really well, you can apply it to them, it might not be the people they talk to or see most, hell I haven't seen Jme in ages, but there's usually not more than 5 of them. Even where couples are concerned, its usually the case that someone is closer with one than the other, because they knew them first, or because they have more in common.
As my 5 people change throughout the year, I'll try and let you know, you might find it interesting.
Mood: much the same as before, with a bit of depression mixed in.