As if I don't have enough reasons to trust social media companies ...

... here's another one:

https://www.pcmag.com/news/367319/facebook-stored-up-to-600m-user-passwords-in-plain-text

Facebook Stored Up to 600M User Passwords in Plain Text

Facebook engineers built applications that stored unencrypted passwords on internal servers which could be searched by over 20,000 employees.