My last.fm scrobbles about three seconds of a track as a full track. I think it depends on the player. I used to have iTunes and the track wouldn't scrobble until 1/2-3/4 through the song. Now that I have Winamp, it takes much quicker.
So yeah, I guess it's possible some people aren't listening to the full track, though the numbers don't surprise me much given the mass hype this band has on the internet.
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