Here are some examples of what the requirements should be for Facebook. However, it is worth warning: there is no single agreed definition of what each type of requirement is, therefore I gave a definition for you that I chose for each case.
I am sure that all of them can be improved in one way or another, but I believe that these are worthy requirements.
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- U1. .
- U2. , , U1, , - , .
- U3. , , , , (. U2).
- U4. , U3, , , .
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- F1. 63 206 . [ref U1]
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- N1. - (. U1), (. U3) 30 90% .
- N 2. ( , ) 3 90% .
- N3. 50% 1 .