You can invite someone to Signal using the "Invite Friends" menu in the app, which will send a text message or email.

Google Duo is a free video chat app that lets you make video or voice calls and send messages from any device. Here's how to ...

If you hadn’t heard of Signal before Monday, chances are you have now. The secure messaging app, available for iPhones and Android devices, has long been popular with journalists because of its robust ...