From blogger Mike Sheehan: Tween Tribune posts age appropriate news stories found on the internet for students grades K-12. The stories are sorted by age group and there is spanish section as well. At the end of each story, students can respond by leaving comments or take a quiz.
The TedED tool lets you "Flip" any YouTube video. There are several sections where you can add resources, build a simple quiz, have a discussion, and then provide further links, etc., for a "Deeper Dive". There are summaries available for each lesson, showing how many students have viewed lessons, answered questions, etc. This is a pretty awesome concept.