hey its "na neun ara mae ib ni da". anyway, the pic is not you right? cuz i know who the girl in pic is. i saw her on news article

그래, 웃기다 웃겨~! would be fit to that situation as usual expression. as for more tips for that expression, if you use the word like "freaking or hell" or sentense(in korean) which is something extreme emphasis expression more than times of it is supposed to be used, it means not "they meant to say", the opposite of the meaning.

~이/가 있는 => there is ~ ~이/가 없는 => there is no ~

친애하는 (person's name) 에게 => Dear person's name. or To ~ actually, if its for you firend, there is no such form as "dear, sincerely .." just write as you speak to ur friend. we never use 친애하는 to friend as long as it is in informal realtionship

~ 고 싶은데요. => i would like to ~ ~ 고 싶어요? => do u want to ~? 함께 => together

내가 드디어 트위터 계정을 만들었다니 믿을수 없어~, 항상 난 내가 그 계정을 갖게 될 마지막 사람일 줄 알았어 ㅎㅎ

haha yeah its in seoul. and most of university has own korean language coures for foriegn students.