The difference is one of emphasis and dominance. It can create learning and dialogue networks of people concerned about a particular issue. Although they do contain some news the vast majority of traffic involves networks of people exchanging ideas and learning from each other material that is far from new. For me this was an effective way to learn the language and some of the technical content of quantum mechanics. It helped me to extend my ideas and put them in a context that others could more easily understand.
Technology can change the value of human talents.
That was an important asset for a mathematician in his time but is of little use today. No matter how good a calculator you are you can buy a better one for a few dollars. Inevitably this lowers the value of those skills while opening new possibilities to those with different skills. We are just beginning to understand what can be done and still view this opportunity too narrowly. We want to automate mathematical proofs so we try to create completely automated theorem provers.