A couple of weeks ago I was in a classroom full of entrepreneurial MBA students, as a guest speaker, answering their questions about me and Palo Alto Software and bplans.com, this blog, and so forth.

When they asked me how I managed my online self in social media, my response went something like this:

I don’t do social media clutter. I think of social media as publishing and I try to offer nothing that isn’t useful to a reader. When I’m on Twitter I tweet only what interests me and might interest somebody else. I highlight blog posts I wrote and posts I read that seem worthwhile. I ask questions. I sometimes share something useful about business planning, or small business. I use TweetDeck to manage my Twitter self, and I set TweetDeck up to share that with my Facebook and LinkedIn pages.

Several of the students seemed troubled. One of them asked: “So you never post anything personal? What about who you really are?”

And I realized, with that question, that maybe I was lucky. I got into social media late in life. The topics I care about are business related, and my friends are business related. I was already a published author and business owner. I wasn’t ever tempted to post the kind of personal stuff that gets younger generations in trouble. I was always aware of it as publishing, not just gossip. Most of the students, on the other hand, started on Facebook as high-school or university students. Facebook was fun first, business, if at all, only as an afterthought, later.

So here’s my advice: your social media presence is public. It’s publishing. Never clutter it up with personal trivia, much less drinking parties, embarrassing pictures, inappropriate comments, or anything your adult self might not be proud of. Use phone, sms, and instant messages for playing around with friends. Build a social media presence you’ll be proud of when your next prospective employer, boss, or client looks into it.

Oh, and by the way: you don’t have to call it personal branding. You can just call it taking care of your reputation.