Since about the end of October, many people who work with Adsense advertising as a vehicle to maintain and capitalize on their blogs, they saw a fall of up to 50-60% CTR, and thus of revenue. This issue has been dormant since then.

Yesterday, however, generated a discussion on this in Google Groups, finally issued a response to “adsense pro, moderators of the group (and representatives of Google), in this regard, the original topic:

Hello everybody,

We communicate with you again to provide more information
about the change in the revenue figures that began to
last recorded around October 24.

Through extensive research, we confirmed that
around that time was a change in the conduct of some
campaigns for advertisers with high volume had an effect
negatively on the earnings of a group of editors. Because andalusia
particular impact that these advertisers have on many sites,
there has been a significant change in the number of CTR and
income. Please note that global economic uncertainty and
regional levels can cause behavioral changes in large advertisers
resulting in a negative impact on earnings
Some publishers.

It is important to clarify that not all sites are affected
As measured over time. The impact may be less depending
industry segment and / or theme that represents the site. This is
to each type of site attracts a different set of advertisers and
behaviors do not always coincide.

We hope that in time to receive, recover and even
exceed the expected benefits. We understand the importance
has this topic to our editors and assure them of our
greater commitment to continue working with the objective of ensuring
that Google’s advertising network is the most effective for users,
advertisers and publishers.