del.icio.us was my favorite tool on the internet for a few years (perhaps even still in retrospect). And not far off from the same functionality as Facebook (today). Why purchase such a thing to shut it down?
Money which needed to be burned I guess (for accounting tricks).
Some may be able to calibrate their hearing in this regard with something called Auditory Integration Training. I have done it. It worked. You might also want to read more about CAPD (Central Auditory Processing Disorder).