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.

Facebook Started Showing Trendy Articles In The Timeline !

Is It One Of The Method To Promote Ads ?


What are Facebook Trendy Articles?

"Trendy Articles" are one of the trick by Facebook to promote their sponsors (we can say ads) Actually Today, I was using my Facebook account and I found a Trendy Article is
showing on my Facebook Timeline which I think a sponsored ads by Facebook. 


Before This We Noticed That Facebook Started Showing Ads After Log Out 
If you are using Facebook then you might have notice after Logout ,Facebook is showing ads.I think its a good idea by Facebook to show ads after logout because user might click on these ads. 

But What do You Think Is It a Good Idea to Promote Ads Via Trendy Articles? 
I think Facebook completely want to grow their ads network and want to do anything to promote their ads.

 

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Which database does Facebook & Google use ?