I'm of the belief that there are no truly original ideas, just new combinations of old ideas. The more old ideas you know the more creative you can be. This is just an opinion though.
I also think group think is more of a problem among the uneducated. I doubt making knowledge more available will increase group think, although I agree it will certainly not get rid of it either.
That's got the parts of creativity, but what is needed is parts to do something, and then restrictions. It sounds crazy, but when we have no restrictions, creativity suffers badly. This is tied to education, where you are given a project which might sound weird, like photographing hedges ( I was assigned this once) and you have to produce something worth looking at.
The basic preise though is very interesting, because once you have a huge tool set, the creative mind can work with th restrictions. Awesome.
Now, to the idea that technology dumbs people down, and to the point of groupthink or stupid people - it does not dumb people down at all.
It might look like it's making people stupid - but what it really does is allow people who are already stupid, access to technology that a few years back was only accessible by smart people.
The young lady that brags about robbing a bank - http://www.youtube.com/watch?v... - is already stupid.
The people hwo bitch about their employers on Facebook http://www.huffingtonpost.com/... - are stupid.
None of these are caused by the technology. They are what happens when stupid people get hold of it.