backdraft7 - 1:30 pm on Jul 30, 2013 (gmt 0)
...to ad network partners, simple as that.
All longtails are redirected
Beside that, it also appears they are shifting referrals heavily now. Ours went from authoritative / topic related sites that we've been getting referrals from for years, to one page content farm aggregation articles (scraped) and their associated on page ads. Also seeing referrals from search.domain.com type sites. Targeting is much lower quality now.
We've listened to the claims for years, "user experience" is clearly NOT their goal. It's all about maximizing profits, so avoid the headaches, stop banging your heads against the wall trying to figure out their algo. Remember, they don't want you to know.
What we are witnessing is the slow death of the free market internet we used to know and love.