https://www.onphpid.com/laravel-5-4-login-facebook-google-github-linkedin-bitbucket-bahasa-indonesia.html

SocialAccount.php

<?php

namespace App\Models;

use App\User;
use Illuminate\Database\Eloquent\Model;

class SocialAccount extends Model
{
    protected $fillable = [
        'user_id',
        'provider_user_id',
        'provider',
        'created_at',
        'updated_at'
    ];

    public function user()
    {
        return $this->belongsTo(User::class);
    }
}