When attempting to connect with my local web server I get
POST to http://mysite.localhost.com/index.php?mcsf_action=authorized&salt=0fa7a07a0df08dsf08sdf08&user_id=1 failed: Couldn't resolve host 'mysite.localhost.com'
This is very frustrating. I don't care if socialize-this.com can't resolve a localhost domain, just POST it anyway and let my browser take care of it. The old login method was much better.
For those in the same boat as me you can download the old version of the plugin here.