What does "w" which Japanese people always use mean ?

Question

I often see it at YOUTUBE and NICO-NICO-DOGA .

If I understand it , youtube and niconicodoga make me more fun than before .

Answer 1

w = 笑い　(warai) = lol

also in ギャル文字 (gyaru moji)

w represents the hiagana ん　

:)  

Answer 2

w＝ lol

warai^-^

Answer 3

W =  Warau, 笑う = laugh

It is not polite expression but kind of typical  on-web expression  in Japanese.

笑　or 　爆笑　or 大爆笑　are same.

wwwwwwww... for example  means equal to laugh out loud

Answer 4

Warai means laugh in Japanese. So the "w" represents smile or laugh. Someone from the Japan section on Yahoo! Answers told me this not too long ago, haha.