Google Building Mini-Ad Networks

Google has been sending emails out to publishers that use Google AdSense, advising them to prepare for a new “custom placement packs program” that will combine publishers into packages, so advertisers can easier find and target publishers under a certain topic. In a sense, each ad pack becomes a mini ad network for advertisers to target, increasing exposure for publishers who get into the packs. Since Barry published it anyway, here’s the email I got:
Dear Publisher,
After a recent review of your site, we would like to include blognewschannel.com in our custom placement packs program. Custom placement packs are selections of individually-reviewed sites designed for our largest brand advertisers.
We would like to feature your site more frequently in these advertiser packages, but to do so, we need you to place more image and text-enabled medium rectangle ad units (300×250) on your site. Visit https://www.google.com/adsense/adformats […]

Original post by Nathan Weinberg