First, this sounds like an awesome plugin and can't wait to test it out! Really useful plugin!
I wanted to ask if you have any plans to integrate an Imgur.com login with the plugin? They've made their API available, so since that is one of the growing sites out there, it might be useful to have their login for growth.
Also, how is naming handled in the database when different people from different networks have the same username?
Thanks for the work you put into this plugin and can't wait to get started with it!