It's a method of annotating messages on some social media sites with metadata. For example, I can post the message "Mishimas = WIN #tekken #imba" Then when anyone searches for the hashtags #tekken or #imba, my message will appear in the search results. It's also used to monitor trends, or the zeitgeist of the internet. As more people use a particular hashtag ("Gonna vote for #Juju!"), they will appear higher in trend lists. (twitter trends for Cape Town: http://trendsmap.com/local/za/cape+town) Elsewhere they are mostly a crutch for the inarticulate. Poor man's vocab, if you will. Can also be used to look deceptively hip (read: trite). "Hmm... morning coffee at Origin #bliss" They can however in other contexts be used reasonably sensibly to convey humour or emotion. eg. Labelling a photo of yourself from the Twilight Run next to a guy dressed like a pair of scissors "#YOLO" On Wed, Aug 27, 2014 at 4:49 PM, Nicholas Robertson-Muir <nicmuir@xxxxxxxxx> wrote: > You could get Paas to weaponise this flu of mine instead. > I've been in bed for 4 days now. > > On the upside... now at One Piece episode 594. > > What is the whole # thing about anyway? > Pardon my dis-interest. > > ...and Chopper is awesome. > ...just saying. >