The hashtag turns 10 today, and inventor Chris Messina -- aka user no 1186 on Twitter -- has explained how a small group of early Twitter users wanted to make conversations easier to follow.

"Lots of folks suggested that Twitter should just add web forums, with all the typical management overhead, but I felt that forums weren't forward looking enough," Messina, now head of community and growth at Neonmob, an art trading website, told the Australian this week. "Web forums would be a pain [...] in the coming mobile era! Remember, the iPhone came out a few months before I suggested hashtags!)"

Thus, on August 23, 2007, Chris Messina tweeted: "how do you feel about using # (pound) for groups. As in #barcamp [msg]??"

Messina, who says he chose not to patent the idea because that would likely have slowed its adoption, has said he had no interest in making money from his invention.

"They are born of the internet, and should be owned by no one. The value and satisfaction I derive from seeing my funny little hack used as widely as it is today is valuable enough for me to be relieved that I had the foresight not to try to lock down this stupidly simple but effective idea."

A decade on, and Messina describes the adoption of this simple system of information collection (globally an average of 125 million hashtags are shared daily on Twitter alone) as humbling.

"It's thrilling to see how this little idea that came out of a very specific moment in the evolution of the Internet took off and has grown into something far bigger than me, bigger than Twitter or Instagram, and that will hopefully maintain its relevance for a long time to come," he told the Australian.

But for all their benefits, hashtags have also proved a minefield for inattentive creators. The identity marketing blog loginradius draws attention to a number of miscued, careless or otherwise unfortunate, hashtag misfires.

First among them is the hashtag created for British singer Susan Boyle #susanalbumparty. "Su's anal bum party" caught on for obvious but unintended reasons. Loginradius points out that capitalizing each word -- #SusanAlbumParty -- would have solved the problem.

In the same prurient vein, Blackberry's use of #RIMjobs to announce new hiring caused the Canadian tech company embarrassment.

Loginradius also drew attention to #WTFF, a hashtag Burger King used to draw attention to its new low-fat French fries.

Hashtags frequently backfire when they are hijacked to make a political point. That happened when the New York police department, using #MyNYPD, invited members of the public to post pictures of themselves with police officers. That prompted a flood of pictures depicting police brutality. Similarly doomed was a CNN project tagged #AskACop.

On this, the 10th birthday of the hashtag, Twitter co-founder Biz Stone recalled in a post that Messina proposed the idea on a day that the site had crashed.

"It was an undeniably elegant proposal, but I really needed to get back to work. I turned back to my computer screen to help get Twitter back up and running, hurriedly ending the conversation with a sarcastic, 'Sure, we'll get right on that.'" #fail