OAuth? ,OpenID? Neither? Which one should my site support?

Question

I working on a new website and wanted some advice/feedback on OAuth vs OpenID vs Standard site owned username/password.

Answer 1

Keep in mind that even if your site doesn't need to access your users' private data on other sites, OAuth may still apply if you site has data that users may want to access either through an API or from another web site. With OAuth, either end or both might apply to your site.