Ouch, that snippet is ancient (I am kinda its author, more precisely adapted to twitter from other snippet). I would strongly consider using some newer solution. I had later made newer and written from scratch version, try it http://www.rarst.net/script/twitter-counts-wordpress/
This plugin should suit your needs! http://wordpress.org/extend/plugins/oa-social-login/
What happens when you try it with all your plugins disabled? What happens when you try is with the default WP theme? What happens when you try it with a different browser that has no browser extensions or add-ins installed? What happens when you set twitter.com -> 127.0.0.1 as suggested?
Share comment to twitter after publishing [closed]
Trying to inject twitter metadata into using wp_head action in functions.php – get_the_excerpt() returns null
How to Hide Ancestors/Threads in Embedded Tweets
Hi @Andy: Are you up for developing something in PHP and jQuery? It should’t be too hard to add a button that would do an AJAX submit to add How many total followers do you except anyone to have on your site. If the number is less than 1000 you might get away with just … Read more
There is a plugin ‘Social Login for WordPress’ which serves the functions you are looking for. This plugin not only allows users to log in but also creates users on your website and auto-fill various fields in registration form. The plugin is FREE but there are white label and customized solutions available from LoginRadius.
I have seen many plugins do it this way. But it definitely seems like a very tedious step to follow for the user in order to use the plugin… Is it the right method? Yes. Should I somehow, store my Consumer API key & secret details on my server? And any of my distributed plugins … Read more
Don’t know if this will give you everything you’re looking for, but I like Twitter Tools by Alex King.