Something that I missed seeing in your screenshot before is that you have the 'Automatic Registration' enabled. However, you mentioned that you want clicking on the social login buttons to go to
www.opensourceliving.org/index.php/register/steps/1. These two conflict, because if it is enabled, JFBConnect will automatically create the user and log in without going through the steps.
1. If you do not want Automatic Registration and want it to go to the EasySocial setup step 1, the login occurs correctly once the setting for Automatic Registration is disabled.
2. If you want Automatic Registration enabled, I narrowed down the 404 error occurring when the 'User - K2' plugin is enabled. When this plugin is disabled, the user is created and authenticated properly with the social network credentials.
This should get you closer to solving the issue since it's narrowed down to that plugin, whether you just want to disable the setting or delve into what's causing the redirect problem from K2.
-Melissa