Which database does Facebook & Google use ?

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.

How to Get Email ids of your all Facebook Friends using yahoo id

If you want to know email id of your facebook friends which is hidden and not showing in your friends facebook profile so here is the trick through which you can get email addresses of your all facebook friends . Just Follow Below Given Simple Steps : -
Step 1 – If your facebook account is not connected with Yahoo id then first Create an email id in yahoo and connect your facebook account with yahoo Email Id . 
Step 2 Now Login to Yahoo Mail and then go to the Contacts Tab. 
Step 3 – Click on Import Contatcs. 
Step 4 – Now Click on Facebook.
Step 5 In Pop Up You will get Message that Do you want to Share your Contacts with Yahoo ! Click on OK .
Step 6 – Now you will get Message 
Step 7 – Thats it ! Click on View imported contacts and See your facebook friends Email Ids.

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