The company makes money from display ads and from partnerships with other media companies.
The group's revenue stream comes from partnerships in local jurisdictions and targeted advertising.
But Mr. Skilling raised some concern about the compensation from partnerships, the notes said.
Some activists, including Bragg, are concerned that conflicts of interest could potentially arise from partnerships between corporations and government.
Investment banking started changing in the 1970s, when some Wall Street firms began switching from partnerships to public companies.
He suggested that money could come from partnerships with universities and commercial cable companies like AOL Time Warner.
The couple's income included $450,245 in salary from companies they control and about $2.53 million in income from partnerships and corporations, including Gingrich Productions.
These include rents; royalties; income from operating a business; alimony received; share of income from partnerships and S-corporations; income tax refunds; and the ever-popular gambling winnings.
"When these firms changed from partnerships to public companies, the ethos changed dramatically," said Charles M. Elson, a professor of corporate governance at the University of Delaware.
The nation is losing untold tens of billions of dollars in unpaid taxes each year -- as much as $64 billion from partnerships alone, according to one estimate.
