Signal app for the Mac could expose private messages
<p style="white-space: pre-wrap;">If you use the Signal desktop client on a Mac, be careful with the app’s as they may expose your private messages, reports <a href="https://motherboard.vice.com/en_us/article/kzke7z/signal-disappearing-messages-are-stored-indefinitely-on-mac-hard-drives" target="_blank" rel="noopener noreferrer"><em>Motherboard</em></a>.</p>