and use hacker names Amusing to see this phrased, since even before the Internet we had a perfectly cromulent word for this: handle.
handle, username, pseudonym, account name, etc. You were told never to give your real name or any identifying info on the internet. It wasn't until facebook that people started using their real name in droves. Another reason to despise facebook.
When I first got on irc in '94, I often exchanged name and phone numbers with people within hours of talking to them, and more than once I met people in real life within hours of talking to them. Nobody batted an eyelid at that at the time.
The panic over people giving out their real name started first years later, especially as people started getting worried about strangers talking to children more than anything.