Storify lets you curate social networks to build social stories, bringing together media scattered across the web into a coherent narrative.
Here are a few guides for how to start using Storify for journalism:
A guide to Storify for journalists by Kelly Fincham
5 “Rules” for Journalists Using Storify by Staci Baird
Q&A with Storify founder Burt Herman (Nieman Lab)
How to use Storify tutorial by Andrew Knight