Help!

[catoidtang]

"Do you like reading Japanese comics? (This) has become a norm for teenagers...."

Why I cannot use "this"? My teacher told me to use "it"? Any reason behind?

[5jj]

I think you can use 'this'.

Try to give your thread a good title; people will see the title and decide whether to open it and read it or not.

Help! or Urgent Help Required!!!!!!
These are not good titles; they give no idea of what the thread is about.

'It' or 'this'?
This title is clear and people will instantly know what the thread is about. Try to include the theme or topic of the thread in the title. If you include keywords in the title, the forum software will automatically display threads with th same keywords at the bottom of the page, so you will be able to see other discussions on similar topics.