Signal has become one the most used app for messaging. It provides the most secure way to chat and call to your loved ones. Its private and secure system makes it more reliable than other apps like WhatsApp and Facebook messenger. It includes all the basic messaging tools you are going to need including read receipts, emoji support, group chats, voice and video calls. 

This app is free to use and available for android, iOS and chrome. This app uses your mobile phone number to identify you to your contacts so there are no username or password to remember. On android, you can send normal SMS and MMS message while using signal to those contacts as well who don’t have this app installed. 

Facebook is a social platform that connects people by offering them a platform to interact, transact, and share ideas and posts.
 It was co-founded by Mark Zuckerberg and had a total of more than 5 billion downloads and over ninety million reviews.