Which database does Facebook & Google use ?

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Facebook has moved to a NoSQL database named HBase. Google uses their own system called BigTable. What is NoSQL ? NoSQL is a term used to designate databases which differ from classic relational databases. NoSQL database management systems are useful when working with a huge quantity of data when the data's nature does not require a relational model. The data can be structured, but NoSQL is used when what really matters is the ability to store and retrieve great quantities of data, not the relationships between the elements.
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Google Released A New Blog For Regular Updates On Google Search Algorithms !

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Inside Search on Blogspot.com

Google launched a new blog on 18th May 2011 for regular updates on Google search algorithms. If you are a webmaster and want to see learn Google Algorithms then you may learn Google algorithms by reading this blog.

In only 3 days there were around 3962 subscriber for this blog. I think you must follow this blog, If you want to learn some thing new from Google algorithms.
 
Google explained about +1 button and social search of your network in Google Search Engine.

For example, Google may show results from your twitter account or from any other social media. These result will be shown to you only whenever you will login to your social media account.

You can check this blog at here InsideSearch.blogspot.com

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