The below is an example login form for social login.
{# Display any success/notice or errors relating to login #}
{{ craft.socialLogin.getNotice() }}
{{ craft.socialLogin.getError() }}
<a href="{{ craft.socialLogin.getLoginUrl('facebook') }}">Login to Facebook</a>
It would also be common to list out all your enabled login providers.
{# Display any success/notice or errors relating to login #}
{{ craft.socialLogin.getNotice() }}
{{ craft.socialLogin.getError() }}
{% for provider in craft.socialLogin.getLoginProviders() %}
<a href="{{ craft.socialLogin.getLoginUrl(provider.handle) }}">Login to {{ provider.name }}</a>
{% endfor %}