Researchers behind the renowned dictionaries pick a prominent word or expression in the English language each year that best reflects the mood of the times. Judy Pearsall, the editorial director for Oxford Dictionaries, said "selfie" appeared to have been first used in 2002 on an Australian online forum, and the hashtag #selfie appeared on the photo-sharing website Flickr in 2004. The term beat other buzzwords including "twerk," the sexually provocative dance move that got a huge boost in usage thanks to an attention-grabbing performance by pop star Miley Cyrus; "showrooming," the practice of visiting a shop to look at a product before buying it online at a lower price; and "Bitcoin," the digital currency that gained widespread media attention.