Depends on the circles.
On the other hand, I accessed Usenet from a company computer which had my real name and company email. And the local forum on my BBS, most people used their real names and we even got together in person from time to time.
On Instagram, I've also noticed a lot of young people who share e.g. art have a completely anonymous profile (and I guess probably another, non-anonymous profile for their friends only).
Not sure about Snapchat or TikTok, though.
Let's say you want to keep your work, hobby and private profiles completely separate. You'd need to have one with the official client and the other two with a separate browser each. Also you'd need to be super careful when joining a new server for any category to make doubleplussure you're not joining with the wrong profile.
Privacy is a lost cause, the younger generations don't care.
I remember when people were warned about sharing their real information online. over 50% of people I knew were just nicknames on the internet. I had zero clue about their gender, where they lived or what they did for a living. Didn't affect our conversations the least bit.
Now everyone is plastering their faces everywhere they go. Every picture they take has their face next to it. Usually along with their name, the location and the exact time they were in there and who they were with.