Why was Facebook Down ??

Yesterday, Facebook was Down For About 5 hours. 

While Facebook was Trying to Update Their App, So Problem Arrived at Compiling Their new code for the update, servers probably encountered some sort of Problem with Their updation. 

After Findings Facebook got to know they had just Missed "; " Command after end of their new code, so the whole system encountered problem While Uploading Code, So As it's Resulting in Server Down Problem For Their Application. 

The compilation is necessary for Code For Uploading. 

Compilation Means to determine if Code Has any Problem to Identify a Program must be Completed by Compliance. 

If Code has Something Irrelevant to it, Compliance will Understand it & Will warn User By information Indication of it.

It determines the Code &
Stops the process of updating it.