What's the difference between openid and social login?

ShinyProxy provides variety of authentication methods. I’ve been trying to set up a social login(e.g. Google, Facebook…) and it was not that big a deal thanks to ShinyProxy.
With openid and social authentication option, both look working almost the same, and I’m wondering what makes them different. Is there any functional difference except that openid method cannot use multiple authentication vendors at the same time?