To some, an email isn't complete without the inclusion of :-) or :-(. To others, the very idea of using "emoticons" - communicative graphics - makes the blood boil and represents all that has gone wrong with the English language.
Regardless of your view, as emoticons celebrate their 30th anniversary this month, it is accepted that they are here stay. Their birth can be traced to the precise minute: 11:44am on 19 September 1982. At that moment, Professor Scott Fahlman, of Carnegie Mellon University in Pittsburgh, sent an email on an online electronic bulletin board that included the first use of the sideways smiley face: "I propose the following character sequence for joke markers: :-) Read it sideways." More than anyone, he must take the credit - or the blame.
The aim was simple: to allow those who posted on the university's bulletin board to distinguish between those attempting to write humorous emails and those who weren't. Professor Fahlman had seen how simple jokes were often misunderstood and attempted to find a way around the problem.
This weekend, the professor, a computer science researcher who still works at the university, says he is amazed his smiley face took off: "This was a little bit of silliness that I tossed into a discussion about physics," he says. "It was ten minutes of my life. I expected my note might amuse a few of my friends, and that would be the end of it."
But once his initial email had been sent, it wasn't long before it spread to other universities and research labs via the primitive computer networks of the day. Within months, it had gone global.