These are top and recommended social media login extension for Magento 1 & 2
1. Landofcoder

This is a perfect extension for you to create your affiliate program. As you may know, affiliate marketing is one of the most important marketing tools for selling online. It helps you to drive more sales from your affiliate channels and let your affiliate earn money. It is fully responsive, fast and easy for affiliate partners to join your program

Link: https://landofcoder.com/magento-2-affiliate-extension.html

2. Mageplaza
Discovering the huge benefits from Affiliate Marketing, Mageplaza releases Affiliate extension based on Magento 2 platform for all eCommerce stores. This module becomes a crucial marketing tool when allowing to build multiple affiliate programs with a variety of actions to earn the commission as you need for the own Affiliate system.
Link: https://www.mageplaza.com/magento-2-affiliate-extension/

3. Magestore
Affiliate Plus is the perfect Magento affiliate extension to create your own Magento affiliate program, which has been proved to be a crucial marketing tool for every online store nowadays. Starting with the Standard edition, it’s responsive and fully consists of all the basic, essential features for your store’s affiliate program success.
Link: https://www.magestore.com/magento-2-affiliateplus.html

I also want suggest this one: https://mirasvit.com/magento-2-extensions/affiliate.html