> This is literally what twitter is.

Perhaps technically, but I think by "aggregate" she means by crawling, rather than places where people post themselves.

> I think that a rule that says you're not allowed to quote other people would be harmful to society.

Actual journalism, which just quotes parts or mentions the content in order to comment upon it (like you did), is very different from what she's criticizing, which is wholesale copying without any further purpose.