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Google uses a 4 Level Orkut login which makes it difficult to hack Orkut using brute force attack.

First Level - Security-SSL or 128 bit secured connection
Second Level – Google account checks for cookie in the sytem of user

Third Level – Google provides a redirection to the entered User information

Fourth Level – Google doesn’t use conventional php/aspx/asp coding. So it is impossible to hack Orkut using input validation attack!!!