The experience of viewing The Social Network is akin to data-mining.

FORBES: The Lonely Network

So does DoubleClick, a data-mining ad "network" that monitors behavior on 1, 400 Web sites and has more than 80 million user profiles in its database.

FORBES: The Killer Ad Machine

There are mashups that let you see which products are selling best on eBay , that help manage the sale of foreclosed property through a network of real estate agents, or merge sales information with data mining from analysis firm Business Objects .

FORBES: The Business Mash