Hey JanChan!
First of all, welcome to AN!

It's always good to see new posters around
I'm also doing Japanese SL this year, and have done Chinese SLA a few years ago.
Regarding detailed study 1 min intro, the assessors don't really fuss too much about the exact name of the sources, but rather the
type of sources you used. (e.g video, article, etc.)
This is what I have for my Japanese DS intro, and I've checked it with my teacher (who is an oral examiner):
このトピックを勉強するために、NHKニュースのビデオを見たり、毎日新聞の記事を読んだり、姉妹校の留学生へインタビューをしたりしました。
Personally, just saying "internet" is a little bit vague, maybe narrow it down to the organisation? shouldn't take up more than a few extra seconds
I guess it comes down to how you're feeling about your intro at the moment.
If you're really tight on time for your 1 min intro, then just keep doing what you're doing
If you got a few seconds to spare, it's nice to be just a little bit more specific
After all, the main focus is on your subtopics, although the assessors could potentially ask a question regarding sources, I wouldn't stress too much about it
Hope this helped

All the best for your oral!
がんばって!