Question

How to add OpenID or Twitter id or facebook id to Q&A so it will be easy for user to ask or answer question. Thanks!

Answer 1

With a small amount of PHP code, Question2Answer can integrate with any external user management system - take a look at the single sign-on installation instructions here: http://www.question2answer.org/advanced.php

In the case you're asking about, you'd need to build a small layer to implement OpenID (or whatever) logins, and then you can use Question2Answer's support for external user managment to integrate with that layer.

Comments

i realize this function after installation. can setup this as instructions here: http://www.question2answer.org/advanced.php or i need to install new?

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can you enplane detail step by step to do this.  
need to build a small layer - not understand

Answer 2

Now Twitter Facebook dont support OpenID, they support OAuth. But you can implement Google, Yahoo, Aol using OpenID as well as OAuth.

For Implementing facebook and Twitter take a look on this link:

For Facebook   http://developers.facebook.com/docs/reference/plugins/login/

For Twitter        https://dev.twitter.com/docs/twitter-for-websites

Alternate If you want to implement more providers like Google, Yahoo, LinkedIn and more with Facebook Twitter using OpenID and OAuth than you can see this link http://www.loginradius.com/