Site maintenance on August 9 at 10am PDT

Our engineers will be performing routine site maintenance tomorrow, from 10am to 2pm PDT. While you won't be able to log in to your account during these hours, the maintenance won't affect your ad targeting or delivery and your earnings will still be tracked in your reports like always.

To celebrate the opening ceremony of the 2008 Olympic Games, here's the start time of the maintenance in past, present, and future host cities for the Summer Olympics:

Montreal - 1pm Saturday
London - 6pm Saturday
Athens - 8pm Saturday
Beijing - 1am Sunday
Sydney - 3am Sunday

We hope the maintenance period will give you an opportunity to catch a few matches and root for your home country!

Posted by Arlene Lee - AdSense Publisher Support

Defining invalid clicks and click fraud

We often receive questions from new publishers about what these two terms mean, and we'd like to help you understand the difference.

Invalid clicks are clicks for which we decide not to charge our AdWords advertisers, since they may artificially drive up advertiser cost or publisher revenue. These include extraneous clicks without any value to the advertiser, such as the second click of a double-click. They also include many other types of clicks that we've determined aren't motivated by genuine user interest.

"Invalid clicks" are often confused with "clicking on your own ads". However, we'd like to stress that invalid clicks are generally any clicks that artificially inflate advertiser cost or publisher revenue, regardless of their source.

Click fraud is a subset of invalid clicks that are generated with malicious or fraudulent intent -- in other words, clicks that are intended to drive up advertiser cost or publisher revenue artificially. Sources for these clicks include, but are not limited to:

A publisher clicking on his own ads, or encouraging clicks on his ads

Users or family members clicking to support the site / publisher

Third-party programs with user incentives, such as paid-to-click services and click-exchanges

Automated clicking tools, robots, or other deceptive software

The same principles above apply to ad impressions and conversions as well. Some sources of invalid impressions include, but are not limited to:

Excessive page refreshes, generated either manually or automatically

Third-party programs with user incentives, such as paid-to-surf or auto-surf programs

Third-party programs for purchasing fixed amounts of traffic, e.g. "$10 for 1,000 page views"

As a reminder, any method that artificially generates clicks, impressions, or conversions is strictly prohibited by our program policies. You can also find more information about these topics in our Invalid Clicks FAQ and our Ad Traffic Quality Resource Center.

Updated links to resources

Posted by the Google Ad Traffic Quality Team

On your frequency

In the coming months, we'll be rolling out some new foundational features in AdWords for the content network. These features are intended to enhance your earning potential and the effectiveness of ads we serve to users on your sites. Some of the benefits of these features include:

• Frequency capping, which prevents users from repeatedly seeing the same ads on your pages.
  
• Improved attribution, to help advertisers identify the best performing sites in the network based on post-impression activity.
  
• Improved ads quality, as we're able to improve ad performance within the Google content network.
  

You can read about these in more detail on our official Google blog. To enable these features, we'll be implementing a DoubleClick ad serving cookie on the content network. We now have a program policy that covers data usage related to the launch of these new features.

We're excited about these upcoming features that will improve the experience for users and protect privacy while creating more value for our publishers and advertisers.

Posted by Wei Yang - AdSense Publisher Support

A picture isn't always worth a thousand words

The maxim about the Internet is that content is king. While this holds true for AdSense publishers, there’s one important caveat: if it’s not text-based content, our crawler might not notice.

While we’re constantly working to improve our targeting technology, our crawlers need text to properly match ads to your pages. Although images, flash, and streaming video can help spice up a site, relying heavily on these sorts of elements will make it difficult for us to get a good read on what your site is about.

If your site uses a lot of these features, make sure you provide enough text-based content in one of our supported languages to effectively convey the topic of your site. If our crawler doesn’t find enough text, you may get poorly targeted ads or public service ads (PSAs). While we can't say the exact amount of text content that you'll need to receive targeted ads, we do recommend including complete sentences and paragraphs on your pages.

To improve your ad targeting, here are few other pointers:

• Use text in addition to images when possible. Please note that the crawler can't read text contained within images.
  
• If you use images, be sure to title them appropriately and provide descriptive ALT tags.
  
• Try imagining your site without pictures or dynamic content. This will give you a good idea of what our crawler reads. If you lack imagination, you can try turning the images off in your web browser.
  

Finally, it's important to keep in mind that the AdSense for content ads on your site are automatically determined. Though it's not possible to choose the ads that are placed on your site, including more text-based content will help make it possible for our system to target your site correctly.

Posted by Kent Sugarman - AdSense Publisher Support