Maybe it's the sceptics that are right? ... unless the tools are genuinely useful they will fall by the wayside along with the paperless office.
Love the Social Media slideshare above. I have shared it via LinkedIn, a social network that I like - I find it both intuitive and professional. In contrast, I cannot stand Facebook, which I find the opposite; but that is simply a matter of taste.
Talking of slideshare, I recently uploaded a presentation linking broad and inclusive Development (economic, built environment, community etc.) with the Extractive Industries, e.g. Mining, Oil and Gas. Of course, such a linkage does not always happen, all too often there is only "enclave" development where no such +ve development spin-off happens.
I suspect that social media is slower in this Extractive Industries sector than in others, just like the built environment, but with pockets of early-adopters, some of whom will have been burnt by investing loads of £$£$ in an ill-informed way, just as Second Life attracted architectural practices spending lots of money making sure that they looked great on this platform, despite the fact that few of their clients/ potential clients actually used it. The trick then is investing resources on social media in a strategic and informed manner. I will start off with LinkedIn, as is my want, on the basis that I understand it well (which helps) and as it is popular amongst my target group of fellow professionals.
Please do check out the slideshare I mention above:
and the project website behind it (all resources on it available free, no need to register etc.): http://www.eisourcebook.org/
Lastly, my view on "Using social media is no longer a choice for those who wish to remain relevant and engaged?": Yes, in almost all cases.