Even on a night out I've probably bullshitted my way through the first hour or so of a conversation and only given away my first name (actually my surname is funny so comes up a bit when pissed) but people won't remember much of that and there isn't everything else I've said attached to it. I can't see any reason to want to use a real life name online, or give away more than the basic info IRL unless you are specifically putting yourself out there for public reasons or trust the person you're communicating with directly with more, and I'm pretty lackadaisical about my online and offline presence.
Even on a night out I've probably bullshitted my way through the first hour or so of a conversation and only given away my first name (actually my surname is funny so comes up a bit when pissed) but people won't remember much of that and there isn't everything else I've said attached to it. I can't see any reason to want to use a real life name online, or give away more than the basic info IRL unless you are specifically putting yourself out there for public reasons or trust the person you're communicating with directly with more, and I'm pretty lackadaisical about my online and offline presence.