Anyone able to tell me the technological or intellectual usefulness of social media?
It depends on the kind of social media.
I would call the Orbiter forums, or the nasaspaceflight.com forums technological and intellectual useful. Not to mention internal communication via the web/intranet for something like NASA or universities or research facilities in general.
But I tend to consider things like Smartphones and Facebook useless in this context, which is why I don't use things like that. Especially Facebook really is nonsense (and totally overrated regarding the Arab Spring by the way). People use Facebook to post private photos, and what they're eating right now. And maybe soon, who knows, whenever they're on toilet and on which toilet they are sitting on. Why not include a selfpic also? Things like Facebook don't really interconnect people. It happens only virtually. It only makes people addicted/dependent to Smartphones and availability 24/7 @everywhere. Useful for industries, but useless for me. I have "real" friends. And I don't need any technology to talk to them. I do so with my mouth and voice when I meet them in what is called a "real life". It's scary to see more and more people being in the clouds almost everyhwere while their heads are lowered to their smart phones in order to post what they're doing right now, because the world really needs to know that.
I use the Orbiter forums to get information regarding space flight and Orbiter of course. Maybe I write down a few of my opinions like I do right now. But that's it.