Online retailer Amazon says it had its biggest sales day in the UK as shoppers rushed to buy bargains on Black Friday. The UK version of the website sold more than 7.4m items while other retailers had problems with web sales due to huge demand. Retail analysts said online sales were estimated to have passed £1bn on a single day for the first time. Many big stores have opted for a week long sales period this year and IMRG predict figures will reach over £3bn by Monday - which retailers refer to as Cyber Monday. The popular card game Cards Against Humanity collected £42,200 after asking people to pay them $5 on Black Friday, for nothing in return. The company explained '11,247 people gave us $5 or more, and this led to us making a profit of $71,145.