> btw do you remember the time when there were NO selfies on the internet

X-Face was designed in the 1980s as a way to include selfies in email and Usenet message. ;) I didn't start using the internet until after then.

> But the Gmail address I got when I was in university? Still works.

My email address is older than GMail. Through my domain. Google can shut down tomorrow just as easily as Facebook.

> The first email was sent in 1971 by a guy named Ray Tomlinson, who also decided that we should use the @ symbol to separate usernames from host names.

That's ... not quite true. That was the first ARPANET network mail, but email is older. Eg, https://www.multicians.org/thvv/mail-history.html describing MAIL on CTSS in the mid-1960s.