What good does that do when it's still being sent in plain text from the mail server to the recipient? Granted, there are precautions you can take but they're ineffective if they require any additional effort on the part of the sender and recipient (like PGP).
The protocols underpinning some of the more popular services are just not compatible with today's Internet. The likes of HTTP, FTP and the suite of email protocols were designed in an era where the Internet was far more trustworthy. Today, the best security we can offer is an extra layer slapped on top and to be honest, it's not enough for this day and age. It'd be better if we had protocols that were secure out of the box, so to speak (see HTTP 2.0).
What does that have to do with email?
Stuff posted on Facebook is generally intended to be public whereas emails generally aren't. Apples and oranges.







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