As valuable as you make it.

That question reminds me of TV, movies. Not so long ago, when I was in school, teachers would try to find a movie on the topic of a subject we were studying in class. This can be valuable if you start and stop the movie for thoughtful discussions, and not have a video babysit the students.

Same goes for websites. Providing students a web address to go to without any purspose or directions becomes a newer version of technology babysitting our students.