Allowing specific Twitter users to view Wordpress blog

wordpress authentication twitter oauth

Create a Twitter app associated with your protected account. (I would give you the link, but I don't have enough SO points to have more then 2 links in a post. So just Google this step)
Create a custom Wordpress page template for your protected pages. See http://codex.wordpress.org/Pages#Creating_Your_Own_Page_Templates

The following steps should be placed inside your page template code:

Once the user is logged in using your Twitter OAuth plugin that you mention, find the current user's Twitter ID, it will almost certainly be kept in the $_SESSION global somewhere.
Use a PHP wrapper to the Twitter API (like this one https://github.com/abraham/twitteroauth/blob/master/DOCUMENTATION) to call the Twitter API's GET /friends/ids method with the screen_name set to your Twitter handle. You will need the CONSUMER KEY and SECRET given to you in step 1. This will give you a list of your followers.
Check if the logged in user's id is in the list of user ids returned by the previous step. If so then call the_content() to render the pages content, if not then don't make that call.
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