I read Scarlet Imprint's blog post on this and was quite impressed. You won't find me on Facebook, though I do use some other social media like podcasts and a blog. I also use Google+ on a limited basis, but that's probably because I already have my blog feeds and email through their other services. I also am stepping into Goodreads which is another social media site -but one where the focus is on books. The reasons I'm not on Facebook specifically are numerous and I won't go into them here. I'm pretty much in agreement with what Scarlet Imprint said about "cognitive load". Some people might be able to handle that kind of load better than others. For me there is also And while the open source movement definitely has its perks, a lot of great innovation comes from isolating your company or yourself to really hone in on what you are creating. Doing things in "secret" while in the development stage has its advantages. Yet once something is out I think its good to share it. The internet has made that easier, and I really like being able to communicate with other Mages whom I might not otherwise have ever come in contact with. I just prefer to do it over blogs and in forums where the focus is often sharper.
I do think magic can be applied to technology. And I'm also a fan of Pop Culture magic, though most of my tastes are generally pretty different from what many might consider Pop Culture. I go to the avant-garde for the most part, but I've had magical experiences with Doctor Who and have learned a lot from pulp-ular science fiction and fantasy novels -dammit if it ain't some of the best literature out there.
I recommend to anyone who would like to see the potentials of the internet be realized while avoiding some of its inherent pitfalls the book by Jaron Lanier "You Are Not A Gadget". He critiques much of the social media sphere from the point of view of someone who has worked extensively with programming, computers, and virtual reality.
As you can see I am not an Adept at expressing myself in 140 characters or less.