An identity provider provides identities (e.g FB/Twitter/Google). 

Standard industry term.

> On 30 Apr 2014, at 09:12, Phil Sturgeon <notifications@github.com> wrote:
> 
> In README.md:
> 
> > @@ -4,6 +4,8 @@
> >  [![Total Downloads](https://poser.pugx.org/league/oauth2-client/downloads.png)](https://packagist.org/packages/league/oauth2-client)
> >  [![Latest Stable Version](https://poser.pugx.org/league/oauth2-client/v/stable.png)](https://packagist.org/packages/league/oauth2-client)
> >  
> > +This library makes it stupidly simple to integrate your application with OAuth 2.0 identity providers. 
> It's a package, not a library.
> What is an identity provider?
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