My Login UI design

This is our first assignment, my login UI design

I design it for my personal work app which is made up for this assignment. The idea is people can login with their own social media to the app to see my work, my project, my blog etc. Personally, I don't like input bar. I understand for some web/app input bar is necessary but not in this case. People already have too many usernames and passwords to remember. I feel that could be some kind of burden in modern world's minds. I don't feel that I want anybody to register a username and create a password just for my personal app, login with their social media is more than enough. On the other hand, if they decide to leave me some comments for my works, I can easily to tell who they are and what are their background by one click on their name to look up their social media portfile. To me, it is much easier to get the idea who am I dealing with compare with a blank and plain username ID.

Why Facebook?

I think Facebook is the most popular social media. Also, people like to share their life in Facebook. To look up someone's Facebook page you can easily get the idea who they are and what they like to do. Finally, this is one pretty button that I found in internet. There are so many different buttons out there online, but this one is the only one that I like very much. It is HD and well designed, make me want to click on it. I hope it will make everyone wants to click on it as well.

All the other buttons on 2nd page is not as well done as the one button at 1st page. I would like to put all same quality button on my assignment but I don't feel that I should use a lot time to create button at this point. We can see them as placeholder to get the idea how is this login UI look like.

What do you think of my design? Pros and cons? Let me know.