Ke$ha topped the digital pops in 2010

American singer Ke$ha's debut release "Tik Tok" was the biggest-selling digital single in the world last year. It sold 12.8 million copies – three million more than Lady Gaga's "Poker Face", which topped the chart in 2009.

The track, which originally got to No 4 in the UK singles chart, was ahead of Lady Gaga's "Bad Romance" and Eminem's "Love The Way You Lie" in the 2010 chart. The sales figures were released in the annual digital musical report, published by the International Federation of the Phonographic Industry (IFPI). The industry body, which represents 1,400 record companies in 66 countries, said worldwide digital revenues had risen by 6 per cent to £2.8bn, but piracy was still costing jobs.

The report also revealed sales of digital albums rose 29 per cent in the UK, but stated that digital piracy is "growing rapidly" and illegal file-sharing remains "rife", with 76 per cent of the music obtained online in the UK unlicensed.

IFPI chief executive Frances Moore said: "Digital piracy, and the lack of legal tools to fight it, remains the biggest threat to the future of creative industries. Great legitimate music offerings give consumers a wide range of ways to access music. Yet they operate in a market that is rigged by piracy, and they will not survive if action is not taken to address this fundamental problem."