1) Of course, an SSH key is less secure than a password if you don't encrypt it. Or exactly the same security as a password that is stored in Desktop/passwords.txt, anyway.
2) Key exchange doesn't involve the raw transmission of the private key to the remote host. That's kind of the whole point.
[1] By law and convention, greengrocers are not allowed to use apostrophes correctly.
I'm fairly sure you meant *greengrocer's and *apostrophe's there.
NB: I do not have a Facebook account at all, it's been deleted.
Facebook doesn't delete your account, it 'deactivates' it. The only way not to have a facebook account "at all" is not to have had a facebook account in the first place.
(assuming it is actually a meme and not just a single comment people keep reposting)
What is a meme if it is not just a single comment people keep re-posting?
As far as we know, our computer has never had an undetected error. -- Weisert