Facebook Messenger allows users to stay in contact with friends and family members. The app holds the distinction of being downloaded over a billion times by users. Recently, Messenger allowed non-Facebook users to sign up with their phone numbers. It's a simple-to-use app with dozens of features.

Embedded features include video chatting, VoIP calls, and sticker sharing. In fact, users can send and receive money in an instant with PayPal integration. Few messenger clients are as ubiquitous and feature-rich as Facebook Messenger. Tens of millions of people utilize the app on a regular basis, and it's an incredible communication tool.