Quora: the knowledge platform ์•ฑ์ด ๋‹ค์šด๋˜์—ˆ๋‚˜์š”? ์•ฑ ์ƒํƒœ ๋ฐ ์žฅ์•  ๋ณด๊ณ ์„œ | ThisIsDown