Login plugin and user account plugin on CMS Wordpress?

Question

User identification

Good for you. Guys, please tell me, you need a plugin to enter the site through social networks, preferably an advanced one, where you can set up information about yourself. And you need a plugin to display a personal account on an account that is through social networks. I’ll explain as a blonde)) - In general, so that when a person presses “buy”, it is automatically debited from his account, and he buys information, that is, he opens the details of the record, where it is written, for example, an address or phone number. What plugins can do this? (I want to do this whole thing on the Twenty Fifteen theme, if of course you can) you can even tell me which theme is best suited for this.
I will be very grateful and grateful for the answer. I have a link to a cool browser game that you will definitely like)