So, you fail to take a deep breath and count to 10 -- and you post something you probably shouldn't on Twitter or Facebook, or somewhere else online.
You hope it blows over without doing too much damage. But what if you're famous and have thousands, if not millions, of virtual followers?
NFL star Larry Johnson was released by the Kansas City Chiefs after questioning his coach and posting gay slurs for all the world to see. California Gov. Arnold Schwarzenegger was criticized for pulling out a big knife in a video that was posted as a "thank you" to constituents for suggesting ways to cut the state budget.
Those are but two of the recent controversies that social networking helped ignite - and far from the last in an era when fans and gawkers are just waiting for sports stars, celebrities and politicians to say something embarrassing or naughty. New technology makes it that much easier for stars to do that.
"Yes, I get that this is a great promotional tool. It can also be a dagger if not used properly," said Matthew Pace, a New York lawyer who works with agencies that manage athletes and who cautions them about the damage social networking can do to a career.
Syracuse University star receiver Mike Williams discovered those pitfalls when he was suspended from the football team this fall, and then quit shortly after saying on his Facebook page that he hated college.
"I can't see me doing this for long ... hint, hint," Williams also wrote, according to the Syracuse student newspaper.
Those kinds of posts are causing more universities, pro teams and even some movie studios to try to clamp down on the off-the-cuff content their stars put online. Or, at the very least, celebs of all kinds are encouraged to think before they post.
Sometimes, it's about protecting reputations. In other cases, it's about keeping sensitive information from leaking.
One could argue that some celebrities, athletes and politicians have been making fools of themselves for a long time without social networking.
"But there may be a tendency even for really high-profile people to forget that any content you post online is a public statement - and that it is as public as any television or print interview," said Nancy Flynn, a corporate consultant who heads the Ohio-based ePolicy Institute. "It's in your words, so you can't say, 'Well, I was misquoted.' "
Despite the obvious dangers, all of this "microblogging," as it's known, can be worth the risk: Fans like having this kind of direct access to public figures and can be loyal to those who are good at it.
An online stumble here or there can just make celebs seem more real.
"It's a way to understand that they are human," said April Francis, 26, a Chicagoan who works as an "identity consultant," which includes help with wardrobe, branding and public relations for her clients.
On Twitter, she follows everyone from burlesque performer Dita Von Teese to basketball star Shaquille O'Neal -- but recently dropped author Margaret Atwood because she thought Ms. Atwood was "mind-blowingingly boring."
For a lot of fans, it is that -- not controversy -- that's the kiss of death these days.
"It comes down to the interest factor," said Allen Chen, 30, a university worker from Yonkers, N.Y., who follows several professional athletes and authors on Twitter and thinks it's best when they are "funny, entertaining and snarky." He said he recently dropped former New York Knicks player Stephon Marbury and current player Nate Robinson because they were none of those things.
Sometimes it's the celebrity who loses interest in social networking. Teen pop star Miley Cyrus recently stopped Tweeting because she grew weary of tabloids using material she posted.
More often, though, Hollywood types are more than happy to share what some might consider too much information, evidenced on Wonderwall.com, a site that tracks some of the more questionable or buzz-worthy celebrity Tweets.
Consider this one from singer John Mayer: "If you ever see me out and about and I'm punching myself in the pants, leave me be. Personal lessons are being taught/learned."
Or actress Demi Moore: "grabbing my hubby and putting on my birthday suit.....to snuggle.......goooood night. until tomorrow!"
It's all part of the growing school of thought that controversy, or titillation, actually helps a celebrity's career by getting notice, said Richard Laermer, a New York publicist.
"The new PR is about fame that starts and stops with everything that people hear about you. So in order to rise above the noise, you have to be outrageous and controversial," said Mr. Laermer, who talks about the trend in his book "2011: Trendspotting."
Of course, there are limits, he said, noting that most high-profile people generally don't go "astray from who they want their fans to think they are."
In some instances, a few celebrities and athletes have managed to use social networking to help resurrect their images. Chad Ochocinco, the brassy wide receiver for the Cincinnati Bengals, is one of them and even has his own iPhone application.
"It's not that often that I am blown away by a celeb or an athlete, nor am I a fan of the Cincinnati Bengals by any stretch. I am, however, now a big fan of Chad Ochocinco," said Natalie Svider, who works for a digital marketing agency in Los Angeles. "His ability to completely transform the public's perception of him in such a short time and the fact that he is one of the few players that really and truly connects with his fans, is what got me hooked."
In the end, some also might argue that the damage players such as Johnson and Williams did to their reputations likely won't last long.
Mr. Johnson is now playing for the Bengals, a team known for taking on troubled players, though he's a backup running back. Some suspect Williams, who was a junior at Syracuse, will surface in next year's NFL draft.
Mr. Schwarzenegger, meanwhile, shrugged when some people criticized him for using the knife to make light of the budget-cutting process. He said he doesn't want to be seen as "El Stiffo," insinuating that his predecessors might have been a little boring.
Still, with elections at stake and endorsement and movie deals to be lost, those who track social networking say there's a difference between being controversial and too controversial.
"Modern athletes are highly trained on how to handle the local beat reporter, but the ability to speak in real time in a personal yet public space is something that they are clearly learning how to navigate as they go," said Aaron Smith, a research specialist at the Pew Internet & American Life Project. "The norms of what is acceptable in those settings is clearly evolving."
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