The term "contextual" means that the ads, which display on each different blog, are chosen to match the subject in the posts. This assures the ad companies, which pay for the ads hosted on the blogs, that their ads will be seen by people who appreciate the products.
With the ads carefully chosen, AdSense can confidently charge appropriately - and the blog owner can be paid to host the ads.
The blog content is analysed, by the AdSense crawler, as it reads the posts.
The AdSense crawler automatically decides what ads to show, on each blog page.
The crawler, which is similar to a search engine bot, has to be able to read the content.
- Textual content is required.
- Supported languages are required.
- Photo blogs can't qualify.
- JavaScript based templates won't show ads.
- Ads may be displayed day by day - or week by week.
Textual content is required.
The crawler decides what the blog is about, by examining the text in the posts. The posts need to have some minimum amount of text, to make this work.
Supported languages are required.
AdSense ads are designed to be read by people, in their native language. Blogs written in all languages of the world won't have ads - because AdSense does not work with ad companies which sell products for people of all languages.
Only blogs primarily written in supported languages can host AdSense ads.
Please also be aware that placing the AdSense code on pages with content primarily in an unsupported language is not permitted by the AdSense program policies.
If an AdSense publisher uses a legally acquired account from another website, to show ads on a blog written in Bengali, the account will be revoked - and it's a lifetime revocation.
And what ever language you write, the blog must have proper composition, grammar, and spelling.
The minimum age for AdSense publishers is 18 years - partially because you need to have ability to write clearly, in your chosen language. Posts written by a pre teen are not accepted, for blogs hosting AdSense ads.
Photo blogs can't qualify.
The crawler can't read photos. However intriguing or scenic a photo blog may be, it's not going to be approved, to host AdSense ads.
You can include photos, on any suitable blog - but photos cannot substitute for text.
JavaScript based templates won't show ads.
This is a known problem, with the Blogger supplied dynamic templates.
Third party, JavaScript based templates will present a similar problem. Templates that provide numbered pages, and similar features, are JavaScript based. Important post content, hidden behind JavaScript, cannot be read by the crawler.
Similar to JavaScript based templates, some blog owners have added "call to action" / social networking content - JavaScript based popup windows, with "Like my blog!", "Subscribe to my blog!", and similar demands. Here, too, the AdSense crawler will be unable to read the blog.
Ads may be displayed day by day - or week by week.
Just because ads do not display today, that does not mean that they won't display tomorrow - or next week. Conversely, just because ads do display today, does not imply that they will be there tomorrow - or next week.
Ads are displayed when they are available. If your blog shows ads for a given product this week, next week those ads may be discontinued - or they may be displayed on a more interesting or relevant blog next week.
The bottom line.
If you want to host AdSense supplied ads, on your blog, you have to read and heed all AdSense Policies. This is one more requirement, in activating ads on your blog.
And right now, some blog owners may be receiving a congratulatory notice, when approval is yet to be determined.
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Some #Blogger blog owners want to use AdSense to make money with their blog - but they overlook the basic necessities of being an AdSense publisher. Besides the age / content volume issues which are easy enough to define, there is the need for AdSense to be able to properly choose ads to be shown on the blog.
The AdSense crawler, which is a robotic process similar to any search engine, determines the ads to show - if it can crawl the blog and find useful details.
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