WishList Member doesn't include a specific social login option but you can look into the available WordPress social login plugins.
WishList Member creates Member accounts using the WordPress User database. So if you use a plugin that works for Users, it would likely work for Members as well.
Please keep in mind members would still need to register for a Member account using WishList Member. But, if a WordPress plugin allows an existing User to set up a social login, that would likely work for members once they are registered.
A search for “WordPress social login plugin” in the WordPress Plugins Directory brings up a number of options.