Let everyone Know about Scams Going around Thread!
I'm not saying this IS the answer, because I joined in 2011 way before logging in through social media was a "norm"... but I'm thinking, with experience from other websites, is that the logging in through Social Media accounts are a secondary way of preventing spam accounts here on Univox (and others that do it). Them thinking, foolishly, that people will only ever have one social media account per social media place. True that most people do, but the ones that are the reason why you need secondary confirmation of who a person is - are the people that will have 10 Facebook, 10 Twitter, 10 Instagram and 10 Univox (or wherever) accounts to begin it. It's foolish, but it's becoming the norm for sites to want to log you in through social media.
The only other solution, which some sites have done, is the e-verify thing which is a secure site that asks you questions about your life/past to ensure it was you (think - which of these streets have you lived on (and it would list about 5 options), which of these finance companies do you have a loan with, etc.