My Linked Notes
Alex assumes that our social networks are [[scale-free networks]]. When new nodes are added to a scale free network, they are more likely to connect with nodes that already have a lot of connections (the rich get richer type of thing). The networksciencebook has a great chapter on them. It seems generally accepted that many real life networks are approximately scale-free, which is what Alex assumed in his code, but wikipedia says that some papers have found they are more rare than many people realized. Even so, they are a good starting point for experimentation.
One last thing
If you liked these notes, hit me on Twitter!