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Seems to me its far harder to do online, not just from the lack of direct visual clues but also the greater population of non local users or non regulars coming into the game. But also I think there is far more 'new' players online in most casinos though I could be wrong on that
This is interesting information, but since it's available to everybody, some poker players fake those conditions in order to create the wrong impression about their actual state. Check out YouTube videos on big poker games and you'll see it yourself.
Also someone can feel confidently with just two pair, aces and eights, for example, and you can fold with a better hand, three of a kind (eights), thinking that your contestant has at least three of a kind Aces, and that's why he/she is so confident.