Finding up and coming trending/hot articles

Hi guys.

So far on my list, for hot trending and potentially viral content I've got: Google Trends and Reddit.

Are there any other sites that I can add to the list. I found a list a couple of weeks ago and lost it. Thanks Guys I'm just after news trends not buying trends.

http://alltop.com/
http://www.newsana.com/
http://feedly.com/i/discover
https://news.ycombinator.com/
https://www.kifi.com/?m=0
http://lockerdome.com/
http://www.newsnow.co.uk/h/