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I'm not sure - as a user registering on a new site, I think I would prefer it so I could have one less username / password to worry about. On the other hand, I fear that users' current mental model of registering for a site may scare them from using something like OpenID.
How do you make money off of advertising? What are the advantages and disadvantages to both? Is there one that is better than the other depending on what stage your company is in? Is it as simple as asking potential users what they would pay for it?
Thanks very much.