WhatsApp will share its users' personal information, including phone numbers, IP addresses, contacts, & more with Facebook from Feb. 8, according to the new T&Cs. No opt-out. The only way to object is to leave the service & move to a service like Signal or Telegram. https://twitter.com/TheRegister/status/1346957872672907265

Signal and Telegram are now better alternatives if you are concerned about your privacy. Here’s what a Facebook wants out of you on WhatsApp and it’s own site:

And here’s a good tweet on super-privacy messaging apps https://twitter.com/arpagon/status/1346989283593351168

I should add that Signal is the gold standard for Privacy at this point and beats Telegram on a number of fronts.

Here is a very *comprehensive* comparison between messaging apps https://www.securemessagingapps.com/ 

Some messanging apps to consider other than WhatsApp and Facebook Messenger: Allo, iMessage, Riot, Signal, Skype, Telegram, Threema, Viber, Wickr, Wire

Here's another good comparison chart https://docs.google.com/spreadsheets/d/1I_qS5Oy1lRpd6FEw-4AqrFxq-FLN-m6bJPJf2drdwRY/htmlview#gid=0