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The issue is fixed.

The authentication failure was due to deprecation of Twitter API version 1.0. We have updated the plugin to use new version of Twitter API. Please have a try.

Thanks for bringing this into our notice.

Sorry we can’t find AddThis SSI on login or any other pages. Can you point us to the page or test enviornment where you facing the problem?

Thank You for installing our plugin.

Since AddThis SSI is a lightweight javascript plugin, we are performing all type of user authentication on only server side to avoid security issues. So if the system finds an email as existing user on social login, we need to connect that account once. Next time onwards the plugin detects the social authentication credentials and login to the user account connected with it.

Feel free to have any queries.

Sure we will definitely check the compatibility issues with the “theme-my-login”. Thank you for bringing to our attention.

We’ll automatically add login buttons to the standard WordPress screen, but if you’d like to add buttons elsewhere on your theme,
copy and paste the tag <?php addthis_ssi();?> into your templates. Wherever you add them, a login button will appear

To make the plugin lightweight we are using Secured JavaScript API of Facebook and Google for social signing in. For security issues you have to give the url https://www.addthis.com/secure/ssi_callback as callback.

Since we are using Javascript API, there is no need of secret keys for facebook and google.

Sure, The plugin is compatible up to 3.5 versions. Our QA is verifying the plugin compatibility with WP 3.6 versions and will update the compatibility status very soon.

Sorry for the inconvenience. We are not able to reproduce the issue here but we have tracked this and will fix if there any issues regarding this.
To suppress this warning you can use ob_start() at the beginning and ob_flush() at the end of the file addthis_social_sign_in.php (/wp-content/plugins/addthis-social-sign-in/addthis_social_sign_in.php)
So your code will look like below

<?php
ob_start();
...........
....
...
ob_flush();
?>

We will consider your suggestions on future releases. We have released the latest version of our plugin last week with new functionalities such as enabling login popup ( ask user to enter email manually ) and attach existing users with the social authentication.

Thank You for installing our AddThis SSI plugin.
You can use the tag method to display login buttons wherever on the page you want.

Below is the code to show SSI buttons
<?php addthis_ssi();?>

Let us know if you have any difficulties

Thank You for using our plugin,
Our plugin works on the standard wordpress login / register functionality with no issues.
We assume you are using the plugin https://www.ads-software.com/extend/plugins/wp-sliding-login-register-panel/ in your site. Let us check the our SSI plugin compatibility with this plugin and will provide you a solution if there any conflict.

Thank You for the interest in AddThis SSI plugin.

The issue is due to the conflict between the callback URL and domain. To avoid this, on the facebook app settings page leave the App Domains field empty or use addthis.com.

If you like our plugin, please consider rating it.

The issue happened because the form id is missing in the login form created by login-with-ajax plugin.

If you can access the widget_out.php (plugins/login-with-ajax/widget/default/), replace the line 14 with the below line
<form class="lwa-form" action="<?php echo esc_url($this->url_login); ?>" method="post" id="registerform">

Also you need to edit the login-with-ajax.php (plugins/login-with-ajax/) to prevent unnecessary loading of login-with-ajax plugin.
Replace the line 101 with below line
if ( isset( $_REQUEST["login-with-ajax"] ) && ( !empty( $_REQUEST["user_login"] ) || !empty( $_REQUEST["log"] ) ) ) { //AJAX Request

Please let me know if you find any difficulties.

Are you using any plugin for registration using ajax ? If so can you please specify here, so that we can reproduce the issue if any.

Happy to hear that you are able to use the plugin in the comment section.

As of now after sign in you will be redirected to the admin page but you can control the redirect by putting a specific URL in SSI settings page.

In the coming releases we will add this feature so that page will redirect to the same page the logged in.