What is Facebook for iPhone? Do I need it?

Facebook for iPhone is an iPhone app that allows you to use Facebook social media services.

The current version of Facebook for iPhone is 132 and free:

Facebook
By Facebook Inc.

Description:

Keeping up with friends is faster than ever. 
• See what friends are up to
• Share updates, photos and video
• Get notified when friends like and comment on your posts
• Watch and interact with live video
• Play games and use your favorite apps
• Buy and sell items and services

Continued use of GPS running in the background can dramatically decrease 
battery life. Facebook doesn't run GPS in the background unless you give us 
permission by turning on optional features that require this.

Compatibility: 
   Requires iOS 8.0 or later. Compatible with iPhone, iPad, and iPod touch.

Free
Category: Social Networking
Updated: Jul 14, 2017
Version: 132.0
Size: 372 MB

You definitely should use Facebook for iPhone, if you have an iPhone and your friends are using Facebook.

The picture below shows you the Facebook for iPhone in App Store:

⇒ Download and Install Facebook for iPhone

⇐ Facebook for iPhone

⇑ Facebook for iPhone

⇑⇑ Facebook - Frequently Asked Questions