Instagram is adding two-factor authentication to boost security for its 400 million users that include celebrities, artists, and brands; and protect them from malicious attacks. The Facebook-owned company has been testing the feature that is starting to roll out to the social network's users.  

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Instagram's new tool allows users to verify a phone number. In the case a person tries to log into their account using their email and password, the account holder will be then be sent a text message with an authentication code required to gain access to the account.

This provides Instagram users with an extra layer of security. It is not enough for hackers to get users' email and passwords through guessing, stealing, or phishing, according to Tech Crunch.

Wolf Millionaire noticed a two-factor recent codes being tested by Instagram. Users can screenshot or save the authorized phone number to access their account.

Facebook has been using a two-factor authentication option for more than four years. Instagram's procrastination has created a security and financial risk for its users.

If a hacker can access an Instagram account they could cause a lot of stress. For example, they could delete photos and attack friends.

The situation can be annoying and difficult for regular users. However, it can be worse for celebrities, reducing their number of followers and hurting promo chances. Meanwhile, brands can experience lower sales figures and earn a bad reputation.  

In fact, Instagram is a big target for hackers who want to benefit from product/brand placement on the social network's top 10 accounts. Each of them has over 30 million followers, according to Android Authority.

The lack of two-factor authentication was not a problem when Instagram was a startup social network. However, it is now one of the largest social media apps in the world.

The new security feature will likely be available to everyone within the next few months or so. Until then it is still important not to use passwords such as "12345" or "password."   

Instagram's app was released in February 2010. Facebook purchased the social network in April 2012 for about $1 billion in cash and stocks. 

Here's how to choose a strong password: