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Guys,
- Papa October 08, 2012It's impossible to rely on a single centralised counter/machine given the scale of facebook.
The easiest think to do is perform the operation off-line. At runtime, the system should log each search request along with a timestamp and the id of the user the performed the query. This will lead to many different log files across the different servers that handle search. After some time, one can process these files using MapReduce/Hadoop and get the bilionth user.
Then good luck calling the lucky b*st*rd. ;-)