It is announced by Google in several occasion that Content/Ads position is becoming a ranking factor.
What's the rule of thumb actually?
It is known that during January "above the fold" ads on pages started playing a negative factor - actually an algorithm upgrade has been rolled out.
However, what about ads under the fold? How many are too many?
There are some good ad networks offering:
A. In-text ads
B. 125x125 ads
C. Premium CPM ads
etc etc etc. Did some of those above types of networks lost some of their market lately?
In addition, I have received a suggestion from Adsense rep to add the forth ad block under the fold if I want to. It was at the annual Adsense conference in my country on November 2011.
I haven't added this block and even reduced one.
So, I am a bit confused. Any inputs are welcome.