Continue from Google Bot Agent...
Have images on your site? If so, you have likely been visited by our next Google spider the ImageBot.
ImageBot - used to crawl for the Image Search
user agent: GoogleBot-Image
The Imagebot prowls the Web for images to place in Google's image search. Images are ranked based upon their filename, surrounding text, alt text, and page title.
If you have a website that is primarily image based, then you would definitely want to optimize your images to receive some extra Google traffic.
On the other hand, some web sites may not benefit from Google image search. In most cases, the traffic from the Image search engine is very low quality and rarely converts into buyers. Many people are often just looking for images that they can swipe. So, if you want to save some bandwidth, use your robots.txt file to block ImageBot from accessing your image directory.
One of the few exceptions might be if you have a site dedicated to downloadable images.
Our final bot is completely dedicated to the Google Adwords program or Google AdsBot.
Google AdsBot - Checks Adwords landing pages for quality
user agent: AdsBot-Google
AdsBot is one of Google's newest spiders. This new crawler is used to analyze the content of advertising landing pages, which helps determing the Quality score that Google assigns to your ads.
Google uses this Quality score in combination with the amount you bid to determine the position of your ads. Therefore, ads with a high quality score can rank higher even if other advertisers are paying more than you.
This is one of Google's many efforts to ensure that they are delivering the best results to their users.
Can you still block being spidered? Of course, but it will lower your overall Adwords quality score, which could end up lowering the positioning of your ads. If possible, it is best to give AdsBot complete access to your site.
Today's Google bots are becoming more advanced all the time. However, nothing beats relevant, quality, updated content. Deliver that and the search engines will eat it up.
How this Bots can be used in web 2.0 applications
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