Google announced an experimental new vulnerability reward program which is applied to Google web properties.
Web properties includes google.com, youtube.com, blogger.com, orkut.com. For now, Google's client applications (e.g. Android, Picasa, Google Desktop, etc) are not in scope. Google may expand the program in the future.
To Find security flaw, you can use your own account, using any other person account is illegal.
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If you found a bug, Report here:
So spend some time with Google web products and win cash price.