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What is the difference between a Facebook Fan and a Twitter follower?

I have been doing a bit of research into Australian music artists and their number of fans online. My hypothesis was the more album you sold, the more fans you would have on Myspace, Twitter and Facebook.

My white paper that I will release soon, finds benchmarks for ARIA charting artist. I have found the average number of Facebook fans, Myspace friends and Twitter followers of an artist should increase depending on what level of sales they got to on the ARIA chart (Gold, Platinium or 2x Platinium).

But I noticed one really interesting pattern, ex-Australian Idol contestants index really low on Facebook Fans but then really high on Twitter Followers?
For instance, a Gold (35,000+ album/single sales) selling artist the average number of Facebook Fans is 14,000 (e.g Karnivool, Bliss N Eso and Pnau all have between 10-15k for fans). However Australian Idol contestants Wes Carr and Ricki-Lee have a very low number of fans (2000 and 1,700 fans respectively). However when you look at Twitter followers the average is 1,300 followers but Wes and Ricki-Lee have triple that number with 3900 and 3800 respectively?!?!

So why is it that Australian Idol contestants index so low on Facebook fans yet so high on Twitter followers?

I have got no idea, I would be really keen to hear your theory on why this phenomena is occurring. Free Guy Sebastian album for the person who comes up with the right answer!