How facebook system works very fast [closed]

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I am very curious about big social network platforms fast working system in software.Especially Facebook.

As instance,

If i block a user in facebook , i never see that user's messages,shares,images,etc etc.How facebook checks this if i block user or not in every image,share,post,message etc etc.

I also do not understand that , how facebook checks my friendlist friend's datas and bring me datas very fast in mainpage wall ?

I am not sure you understand what i want to tell you or not.But i want to know how facebook and big social platforms softwares are working very fast?

If you can help me i will be very happy.

Any help will be appreciated.

Thanks.

Answer 1

1. Take some of these:

2. Add a few billion dollars

3. Hire an army of witty nerds

4. Done!