A colleague at work tells me I’m the worst tweeter in the world.

I laugh and shrug, but agree he could be right  (some of the time).

Mostly, it’s to do with my inane comments on sport, particularly Australian Football, which I admit I know very little about.

Still that doesn’t stop me winding up my 1200 or so followers, some of whom are friends who support opposing teams to the high-flying Sydney Swans, the team I barrack for.

What can  I say, I like to wind people up by saying this coach couldn’t teach a primary school woodwork class or that full forward couldn’t hit a cow’s arse with a banjo – let alone guide the Sherrin through the middle posts.

My problem is that I occasionally tweet my private thought and let’s be honest everyone has some pretty dark or silly ideas running through their brains at one time or another (before Twitter came along in 2008 the worst you could do is send a text message while drunk or angry) .

Some tweets are so explosively bad, they have the potential to be disastrous.

This was famously illustrated last year when PR executive Justine Sacco tweeted to just 400 followers before boarding a long-haul flight from the US to South Africa:

Twelve or so hours later, her racist remarks had been retweeted thousands of times – by people who had tens of thousands of followers creating a huge multiplier effect – and the Twitter-sphere was up in arms.

A hashtag #HasJustineLandedYet trended around the world and Ms Sacco found herself with 8000 unwanted “followers”.

Ms Sacco lost her job, her reputation was in tatters and she promptly vanished from Twitter and social media to lick her wounds (though amazingly someone has hired her again!)

Of course other more famous people have gotten into trouble for tweeting including fiery cricketer Dave Warner, who tweeted an expletive-ladden attack on cricket writers and was promptly fined by Cricket Australia and Hollywood actor Ashton Kutcher who tweeted to his 8 million followers his support for American college football coach Joe Paterno after he was sacked for not doing enough to prevent the abuse of children by his assistant coach Jerry Sandusky.

A bad tweet can end a career, ruin a reputation and cost a lot of money in legal fees – comedian Roseanne Barr was sued by the parents of George Zimmerman, the man who shot Trayvon Martin – after she tweeted their home address. The Zimmermans claimed Ms Barr incited a lynch mob. She later deleted the tweet but the damage was already done.

Undeniably, Twitter has incredible power.

While Facebook’s influence is arguably waning, Twitter is getting bigger and bigger (pop star Katy Perry has 54 million followers) and it has that incredible multiplier effect through retweets. Give a tweet time (as in the case of Justine Sacco) and the results can be tsunami-like.

Twitter’s power is its immediacy, punchiness (just 140 characters forcing people to condense their thoughts into bite size chunks) and ability to reach so many people.

Unlike Facebook, LinkedIn and others, where there is some level of privacy (messages can be restricted to friends and networks), Twitter is a free-for-all where everything is public.

It’s an addictive place where you can read the private thoughts of some of the world’s most powerful people  like right-wing media baron Rupert Murdoch  – @rupertmurdoch  – who actually writes his own rambling tweets.

It’s where you can interact with your favourite celebrities (who doesn’t like to brag about getting a reply from a favourite actor or a retweet or mention) and get involved in discussions on politics, sport, religion and every topic in between.

There’s a strange kind of pleasure when people from far-flung places respond to your tweets. For example, this exchange after I posted my thoughts on the book Birdsong by Sebastian Faulks, which I had just read. I got a reply from an actor appearing in the play of the novel in the UK.

Twitter is a great place for sharing stories, thoughts, inspiration, recipes, photographs, anecdotes, jokes and grievances (nothing better than winding up a big corporation who can’t help themselves but responding to every criticism).

Twitter is where many of the biggest news stories are broken (I remember a colleague at work shouting out: “Someone has just tweeted that Oscar Pistorious has shot his girlfriend” before it became a huge worldwide story).

But you have to be careful what you write even if you are a humble journo hack like me.

A point I have to keep reminding myself every time I think I’ve thought up something witty to say and have my finger hovering over the “Tweet” button.

“Just remember Justine Sacco,” I tell myself.

Follow me @larryschles