I just read this news from Google blogs that they are now implementing a new web indexing system called Caffeine. So this will be a new puzzle to solve for Search Engine Optimizers, I first read the news from CNN and later I found out that this has been announced in Google Main Blog
So what is caffeine ? According to Google caffeine system is as follows :
Caffeine provides 50 percent fresher results for web searches than our last index, and it’s the largest collection of web content we’ve offered. Whether it’s a news story, a blog or a forum post, you can now find links to relevant content much sooner after it is published than was possible ever before.
Some background for those of you who don’t build search engines for a living like us: when you search Google, you’re not searching the live web. Instead you’re searching Google’s index of the web which, like the list in the back of a book, helps you pinpoint exactly the information you need. (Here’s a good explanation of how it all works.)
So why did we build a new search indexing system? Content on the web is blossoming. It’s growing not just in size and numbers but with the advent of video, images, news and real-time updates, the average webpage is richer and more complex. In addition, people’s expectations for search are higher than they used to be. Searchers want to find the latest relevant content and publishers expect to be found the instant they publish.
You could also see a picture that shows how caffeine works :
You could see from the pics that it is now not based on a hierarchy level but rather on a random sequence. The Index changes from time to time. So will this mean that old post will be turned down by new post, or it will still based more on incoming links. Well it is only Google who knows the answer. So we will see different observation in the future about Caffeine.
Further explanation from Google
Our old index had several layers, some of which were refreshed at a faster rate than others; the main layer would update every couple of weeks. To refresh a layer of the old index, we would analyze the entire web, which meant there was a significant delay between when we found a page and made it available to you.
With Caffeine, we analyze the web in small portions and update our search index on a continuous basis, globally. As we find new pages, or new information on existing pages, we can add these straight to the index. That means you can find fresher information than ever before—no matter when or where it was published.
But as a suggestion just do give Google a fresh and original information and for sure Google will love your blog.