Many Google AdSense publishers are reporting unusually high click-through rates (CTR) on their ads over the weekend.

Alex Chris posted on Twitter, that “many AdSense publishers report HUGE increase in CTR the last 2 days.”

Some are reporting 5,000% increases in CTR, such as at this Google AdSense Help thread. In fact, there are dozens of threads with publishers freaking out that their AdSense accounts will be penalized or banned because of the huge spike in CTR over the weekend.

You can scan through the most recent threads in the by clicking on these links to threads and discussions in the forums.

There are a huge number of publishers incredibly worried about this, which is a good thing – since it is not isolated to just you.

It might be a reporting bug or something more serious, either way, you are in very good company.

There is no word from Google yet on what is causing the spike in CTR.

Forum discussion at Google AdSense Help & Twitter.

Update: Google posted this on the known issues page: