Stephanie Clifford

Real-time bidding allows advertisers to examine web site visitors one by one and bid to serve them ads almost instantly.

The debate over what is appropriate for children continues and all the scrutiny has put children's magazines under pressure.

Trying to ward off regulators, the advertising industry has agreed on a standard icon — a little "i" — that it will add to most online ads that use demographics and behavioral data to tell consumers what is happening.

Business negotiations are moving from closed and discreet to open and political.

Federal Trade Commission Chairman Jon Leibowitz and Consumer Protection Chief David Vladeck question whether the Internet had evolved past privacy policies.

As the radio industry converts from measuring ratings through surveys to monitoring listeners electronically using so-called Portable People Meters, it is finding that what people say they do and what they actually do is different.

If online privacy was once an obscure policy subject, it has come front and center.

Companies that were once content to fight in grocery-store aisles and on television commercials are now choosing a different route — filing lawsuits and other formal grievances challenging their competitors' claims.

About two-thirds of Americans object to online tracking by advertisers — and that number rises once they learn the different ways marketers are following their online movements.

Google plans to introduce a long-awaited new version of an ad exchange, like a stock market, where advertisers and publishers can buy and sell advertising space, filling spots in Web pages on the fly.