I have made a website on which a user has to log in using a username and password. I have seen these in so many website, we can connect through facebook account. And I want to add the same to my web site. How is it possible,using php sdk or the javascript sdk?
Go to m.facebook.com on your mobile browser. Enter one of the following: Email: You can log in with any email that's listed on your Facebook account. Phone number: If you have a mobile number confirmed on your account, you can enter it here (don't add any zeros before the country code, or any symbols).
Type your administrator password into the "Password" text field, which is usually directly below the "Username" or "Email" field. Click the "Log In" button. It's typically below the "Password" text field. Doing so will log you into the website's administrator panel.
The team at Facebook has spent considerable time documenting this, I would suggest you start there:
http://developers.facebook.com/docs/guides/web#login
http://developers.facebook.com/docs/authentication/
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