I think I'm getting the hang of it... hopefully.

After adding a few of the global news sites, and other related news sources to my 'follow list', it really would be duplication tweeting about global news (items already appear on my own listing multiple times). So it's just recommended to follow one of theirs and ours (which will just be AUS news and first sightings - which the global news sites don't cover).

It'll just minimise the amount of time/resources on something that isn't expected to have too many followers anyway (even if I did include global news items).