It looks like those are just a bunch of rendered Tweets being shown/hidden by jQuery to accomplish the fading effect.
If you look at the source of the page, this is the script which accomplishes the effect:
setInterval(function(){
$(’.quote-a’).filter(’:visible’).fadeOut(2000,function(){
if($(this).next(’.quote-a’).size()){
$(this).next().fadeIn(1000);
}
else{
$(’.quote-a’).eq(0).fadeIn(1000);
}
});
},10600);
setInterval(function(){
$('.quote-b').filter(':visible').fadeOut(2000,function(){
if($(this).next('.quote-b').size()){
$(this).next().fadeIn(1000);
}
else{
$('.quote-b').eq(0).fadeIn(1000);
}
});
},11400);