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Why do google plus urls have plus.google.com/u/0 as base url even though all urls work fine without /u/0 at the end. Is there any special purpose behind such a design ?
It’s used by a new feature Google introduced recently, Multiple Sign-in Account, the 0 means default account, 1 would be second account and so on.
Is not exclusive of Google+, you can see it in all the product