You really have to consider both usenet and email as social networks. I think they get left out because they existed long before someone came up with the name 'social network'.
I even think that the original social network is Ham radio. Granted, it's a restricted set with a fairly high entrance bar, but it is a social network.
Even the idea of Twitter seems to me to be a total waste of time.
I use email for virtually all my social contacts. It is much more powerful and easier to use than other sites I've encountered. I just don't see how Facebook or any other social wedsite can offer me any more than I already have.
Survey flawed? No, surveys are designed to show what the survey designer wanted to see. I agree that never is a much better answer. The only "social" network I use is LinkedIn and not for "social" uses.
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Personally, I don't use 'social media' for work purposes outside of connections on LinkedIn but even then, I only look at it every couple of months or so. In most cases, I go directly to the manufacturers' websites for information or to pose a question.
Too many times, even an engineering oriented forum/blog like Global Spec's CR4 is overflowing with what we might call basic questions that usually are covered pretty well in an undergraduate program.
Overall, I find social media to be of little use to the practicing engineer.