### Comment:
wtf is signal.

### REPLY:
https://www.signal.org/ 
  
  
  
 Edit: It's open source, free, and supported by grants/donations. Compared to whatsapp, which has had some scary privacy problems for years: https://www.theguardian.com/technology/2016/aug/25/whatsapp-backlash-facebook-data-privacy-users

### END.