But it's never going to be the perfect image of ourselves, just as how we project ourselves to two people becomes different than when we project ourselves to one. Just as how we project ourselves to three people becomes different from how we project ourselves to two. And scale up to your 400+ friends on the 'book.

So is every social interaction. We're all obsessed with the matter of authenticity, but every personality is extensively contrived in every social environment. The main difference between online and personal signaling is that our online performances are more scripted and our live performances are more impromptu.

Look at yourself, I bet the version of you that you present to your parents is different to the one you present to your friends, which is different to the one you present to your partner, which is different to the one you present at work, etc.

I think it's much more common for people to avoid listing uncool bands that they do listen to. Guilty pleasures, if you will.

But what can they do about it? It's not like they have access to your youtube play logs or winamp stats or anything like more like that from which to derive "you".

IIRC, there's a last.fm app for syncing your Facebook music section every week to your actual top artists for that week.