Slipknot’s popular single “Psychosocial” has been certified gold in the United Kingdom. According to Billboard.com, to ear a gold certification for a single in the U.K., Slipknot had to sell 400,000 units of the song, or get the equivalent number of spins on streaming.The platinum, gold and silver certifications awarded by the British Phonographic Industry in recognition of sales milestones have included audio streaming data since June 2015, with 1,000 streams counting as one “sale.” “Psychosocial” comes from the album  All Hope Is Gone (Roadrunner Records).