GOTYE ft Kimbra's 'Somebody That I Used To Know' is the biggest selling single of 2012 so far, according to The Official Chart Company.
Carly Rae Jepsen's 'Call Me Maybe' is the second biggest selling single, followed by Fun.'s 'We Are Young', ft. Janelle Monae and David Guetta's 'Titanium' ft. Sia.
Nicki Minaj's 'Starships' is in fifth position, despite not reaching the number one spot. –GN