if u know him, he is full of crap, not quiet at all.
depends la, sometimes interaction is needed and u will stand to
lose out on that point.
not all girls can spend the time n effort to go after u.
some just want u to be quiet. 
yeah and at least now he lafs out loud on a show. Before that
its mostly covering the mouth silent lafter. Looks dam ghey for a
man. But still, i think besides his natural personality being
shown(the quiet lafters are due to his shyness), his music
company(dunno what tats called) wants him to talk more.
Guys who laf silently really looks ghey lol. XD