How is it that products that are listed on Ebay end up in the search results on Google and other search engines? Is it set up similar to an RSS feed or does Google just check the site so often that they know about the new listings? How do they do it? How would you mimic what they do for an auction site similar to Ebay? ANy insight is greatly appreciated. Thanks, Kim
They have established so much credibility and respect by google that google visits them all the time and always ranks their stuff high.
When your content is changes frequently, Google will crawl it more frequently. Look at Digg as another example; I've seen new listings being displayed in the same minute as posting. If the Google Bot crawls your site and notices a change, it'll keep crawl it agian- but sooner to see if the content changed. It'll keep doing this until it finds the appropriate interval for your specific site. Keep updating and good luck!
I don't think it's really possible to copy what ebay has done. For years they have been the premier auction website. So they have gained a ton of backlinks and a ton of users. Another auction type website would struggle to achieve what ebay has.
Yes, I agree with you 100% that it would be difficult to compete with Ebay but it seems that they are able to do it because they have built up so much creditability as far as the big G is concerned?
Personally I take advantage of that by posting products and services from time to time on Ebay that I can't seem to push up on the front page.
Its the same here on DP, i have seen many new threads appear in googles results just minutes after being posted!
If you really want to do an auction type site, you have to go more niche oriented. Note that SitePoint has an auction/bidding section in their marketplace for websites. Something like that might be useful, but a generic auction site would not succeed more than likely.
Besides credibility, think how many people link to ebay, and how much ebay links out. Also, most the auctions on ebay are very focused so their keywords will be pretty good for each of those pages as well. Its not hard to be high on google when you are huge.
Google crawls big websites several times a day and their content get indexed very quickly. Ebay has a pagerank of 8 so it is very a important website in Google's eyes.
Ebay having a PR 8 is consider as an authority site. Bots/spiders always visit sites that are as huge as ebay. That's why their contents and pages were always crawled and get indexed in search results.
To benefit from exactly this put some live links into the ebay ads and lap up the link juice. Easy peasy