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I wish you the best of luck with this. It's really well designed.

I launched a very similar service named Accthub about 18 months ago and unfortunately it didn't fare well. Now, there's Mozilla Persona, Stormpath, Userapp, and probably several other in the same space.

Hope you can turn it into a legit business, but the general issue developers had was:

1) This is not a legit issue I have, my framework can handle this in the matter of a few minutes, maybe an hour or two if I want something really complex. 2) Privacy concerns. 3) High availability issues.

Best of luck, I will be monitoring your service closely because I want it to do well.