Not everything that trends is newsworthy, but if it trends, it simply means it's a hot topic that is getting views and clicks.You don't really believe that, do you?
Everything that trends on Twitter is newsworthy?
The 200 million people on Twitter decide everything?
Anytime I see a celebrity name and think about other things that deserve to be trending that are more important than little man bieber and his timbit sized donut balls.
200 million people don't decide, they're just viewing whatever they're viewing and the rest is just incidental, aka, "trending".