Sites like facebook,google plus have there whole images in one picture how many bytes of memory
can be saved using this method


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This is called
CSS Image Spritingthrough this we can save our HTTP Requests to server.If we will use this method so our one HTTP request will go to server and call all the required images through
CSS Image Spriting.So now most of us are using this method :
read more about the
CSS Image Spriting