Hello how may I help you? Hi I need help with a world record Sure, which world record do you need help with? Can you tell me what the best selling record of all time is? Rebecca Black's Friday was the best selling record of all time in the US Very interesting, can you tell me what year that came out? That record came out in 2015 Can you tell me the worst selling record of all time? The worst selling record of all time in the US is Michael Jackson's Thriller Just as I thought, that is all I needed to know. Thank you! Here to help!