graeme_p - 12:29 pm on May 8, 2010 (gmt 0)

Someone earlier said that they are seeing their social network site's CTR popup

How is the CPC of those types of sites doing.

Interest based advertising means that the fact that someone visited a site aimed at a high value niche can be used to show them the high cost ads on other sites.

So interest based advertising may mean that CPCs and eCPMs converge, as they fall on sites targeting expensive niches (as the ads they would previously get start appearing on other sites) and sites that used to have low eCPMs will see a rise.

So we should now just go for volume?

Of course interest based ads may not work out for the reasons people have already brought up.