"It is a small world. You do not have to live in it particularly long to learn that for yourself. There is a theory that, in the whole world, there are only 500 real people (the cast, as it were; all the rest of the people in the world, the theory suggests, are extras) and what is more, they all know each other. And itâ€™s true, or true as far as it goes. In reality the world is made of thousands upon thousands of groups of about 500 people, all of whom will spend their lives bumping into each other, and discovering each other in the same unlikely teashops in Vancouver. There is an unvoidability to this process. Itâ€™s not even coincidence. Itâ€™s just the way the world works, with no regard for individuals or for propriety." (from Neil Gaiman's Anansi Boys) Now obviously this is a work of fiction, but it's interesting to think about anyways... Does anybody ever really meet more than around 500 people? And it's surprising all those times you're on vacation somewhere and you happen to run into people you know even though you had no idea they were going to be there too (or maybe it's only an accident that you or them are there, further making it weird). What are people's thoughts on this...?