Why 上 is being used in these cases? How do I read it?


> 弁護士の小倉秀夫は、 **掲示板上** で投稿が殺到することをフレーミング・炎上、 **ブログ上**
> でコメントが殺到することをコメントスクラムと2つに分類している

I wanted to know why 上 need to be used in these cases.

Couldn't it be just 掲示板 and ブログ?

And I also wanted to know if the reading is really じょう.

Thank you!




It's obvious that they stand for locative case instead of instrumental even
without 上{じょう} here. In that sense, it's not necessary. But 上 makes it clear
that it's locative. In addition, it tends to be used when the location is
virtual one like newspaper or internet, and you are not only a reader but a
speaker.




It's obvious that they stand for locative case instead of instrumental even
without 上{じょう} here. In that sense, it's not necessary. But 上 makes it clear
that it's locative. In addition, it tends to be used when the location is
virtual one like newspaper or internet, and you are not only a reader but a
speaker.

