Forbes.com has expanded its ad guarantee program to include more metrics for advertisers that spend at least $1 million over 90 days. The new Total Guarantee Initiative will specify the number of people reached and the number of messages placed as audited by third party firms such as Ernst and Young. Forbes.com says that the website draws a highly affluent audience numbering 20 million unique visitors a month, but ComScore places the number of visitors at less than 6 million for the month of August.

