so he's actually built a model you can make predictions on?
Which raises the question if one wanted to compete with Google or Facebook what would work?
Sounds quite intriguing actually as I've often wondered if there was theory behind these 2 sided markets (I didn't even know what they were called).
Keep in mind any software IDE is also one of these. Delphi, Eclipse, MS Developer Studio (in alphabetical order) etc.
So yes, quite clever stuff.