In another sign of consolidation in the online ad space, Yahoo has agreed to purchase the remaining 80% stake of Right Media for $680 million. Last year, Yahoo purchased 20% of the 4-year-old company for $40 million.

YouTube is testing video ads with the aim of rolling them out more broadly this summer, Chief Marketing Officer Suzie Reider said this week at an industry conference.

The collaborative encyclopedia Wikipedia has become one of the most popular sites on the Web, according to a report issued this week by the Pew Internet & American Life Project.

Just in time for the next presidential election, reality TV impresario Mark Burnett is taking his brand of entertainment to MySpace, with a competition aimed at picking a political candidate.

Here's the good news. The online readership for newspapers continues to rise. But here's the bad news. Online revenue at newspapers isn't growing as fast as the companies had hoped.

Concerns are growing about Google's increasing influence over media -- and for good reason. As the dominant search engine, Google is emerging as a gatekeeper to the world's information. One day, probably soon, if a business doesn't exist in Google's index, it may as well not exist at all.

In an apparent attempt to boost ad efforts, YouTube is poised to start collecting more detailed demographic information about its users.

The generation of teens that's grown up with instant messaging, online chat and social networking sites might not be quite as cavalier about privacy as it seems. Consider, while the majority of teens (55%) now have online profiles, two-thirds of that group say they restrict who can view their profiles, according to a new study by the Pew Internet & American Life Project.

AOL this morning unveiled five new Web programs at its so-called "First Look" -- a new event aimed at whetting the appetite of online media buyers. But the ventures detailed today appear surprisingly unambitious.

If Google's planned $3.1 billion purchase of DoubleClick goes through, the deal will significantly extend Google's prominence in online advertising. So it's probably not surprising that Google rivals are raising antitrust concerns.