The crazy thing is that major websites like Yahoo don't even know what ads they are serving. And increasingly online ads are an attack vector for viruses and malware. In January Yahoo was serving malware via their online ads.[1] And in February Google did the same.[2]
And of course there are the major privacy issues with companies tracking us online. I understand that online publishing is important and we clearly need a strong press, but publishing really needs to find a new business model. Online ads are not the solution.
[1]: http://www.cnn.com/2014/01/05/tech/yahoo-malware-attack/inde....
[2]: http://labs.bromium.com/2014/02/21/the-wild-wild-web-youtube....