Oauth vs Conventional login system authentication. Which to use?

Question

Imagine the following scenario:

You are setting up a project where anyone can register with basic data (name, photo, age) to use your product. And as it is on the internet there is no way to predict the number of potential users who can sprout overnight.

Well, thinking about this aspect, I would like to know if it is worth using the Apis provided by companies such as Facebook, Twitter and Google to access the data of these users (oAuth), or if yet it is worth keeping the traditional login style, providing a method of registering the user and storing their information on a server of their own.

In my opinion, apparently the strengths of using Uth would be:

• User registration facility;
• Speed in obtaining data;
• Resource savings (since data comes via external API);
• Data always up to date;

But since I never messed with this type of API I honestly don’t know if it’s worth it or not, so, mainly from a scalability point of view, it’s worth using oAuth Apis or conventional login (own bank)?

Answer 1

What I will answer is not an opinion, I believe that most programmers will agree, which makes it almost a rule.

There are advantages and disadvantages of using Facebook login and a conventional system.

Facebook login - Main advantages

1. Eliminates the need to create a new account on your site, just authorize your application to collect the information, preventing the user to create another login and password;
2. Avoid filling out long registration forms;
3. Avoid account validation by email, since this step has already been carried out at the time of registration on Facebook;
4. Information will probably be true once it is used in the user profile.
5. Updating data on Facebook itself, preventing the user from getting incorrect data in your application.

Facebook login - Main disadvantages

1. Fear on the part of some users to make data available on unknown websites.

2. Updates to the Facebook API, which can lead to login crashes and consequently inconvenience for users. Summarizing it is necessary to follow closely the evolution of the tool.

3. Subject to the terms of use of Facebook, the ending nobody knows when Zuckerberg will wake up in a bad mood and decide to charge for the use of the tool and believe me, with the recent modifications on Facebook, I do not doubt!

However use the conventional login, I know people who have abandoned or simply do not use Facebook.

If you have patience, also implement Google+ and Twitter login.

From what I understand, your application is at the beginning, if big companies (like Pinterest, Yahoo, etc... ) use Facebook login to raise new users, let alone us poor mortals.