YOU SAID:

Is you were the inventors of facebook you would've invented facebook.

INTO JAPANESE

あなたが Facebook の発明者だったら、Facebook を発明したでしょう。

BACK INTO ENGLISH

If you were the inventor of Facebook, you would have invented Facebook.

INTO JAPANESE

もしあなたが Facebook の発明者だったら、Facebook を発明したでしょう。

BACK INTO ENGLISH

If you were the inventor of Facebook, you would have invented Facebook.