Mrthdrb

I need to create a user account using social network via the API.

I have created via native iOS application that hooks into magento 2 store API. However, I can not find a way to create an account using any of social extensions.
They add buttons however they do not expose any functionality over rest API for creating accounts or login.

At first create a custom rest api with below route. you can follow this link:
https://alankent.me/2015/07/24/creating-a-new-rest-web-service-in-magento-2/ to create custom res api.

<!-- ws: social login -->
<route url="/V1/customrestapi/login" method="POST">
 <service class="PackageNameCustomRestApiApiSocialloginInterface" method="socialLogin"/>
 <resources>
 <resource ref="anonymous"/>
 </resources>
</route>

Then in the socialLogin method pass the social data as array.Here you can put your logic as shown below code.

/**
* Copyright 2015 Magento. All rights reserved.
* See COPYING.txt for license details.
*/

namespace PackageNameCustomRestApiModel;

use PackageNameCustomRestApiApiSocialloginInterface;
/**
 * Defines the implementaiton class of the calculator service contract.
 */
class Sociallogin implements SocialloginInterface
{

protected $_storeManager;
protected $_scopeConfig;
protected $_objectManager;
protected $_customerFactory;


public function __construct(
MagentoStoreModelStoreManagerInterface $storeManager,
MagentoFrameworkAppConfigScopeConfigInterface $scopeConfig,
MagentoFrameworkObjectManagerInterface $objectManager,
MagentoCustomerModelCustomerFactory $customerFactory
)

 $this->_storeManager = $storeManager;
 $this->_scopeConfig = $scopeConfig;
 $this->_objectManager = $objectManager;
 $this->_customerFactory = $customerFactory;


/**
 * Check Login.
 *
 * @api
 * @param string[] $data The array of strings to socialLogin.
 * @return $this
 */
public function socialLogin($data) 
 // json array for data should be "data":"email":"test@gmail.com","password":"password","type":"fb/gp","socialId":"","socialToken":"","firstName":"","lastName":"","dob":"","gender":""
 // type is used to identify social media facebook or google+
 if($data['type']=='fb')
 // facbook login logic goes here
 
 elseif($data['type']=='gp')
 // google plus login logic goes here