The thing with LinkedIn is that there is no downside to using it, just another tool to advertise your business or professional capabilities. It also has discussion groups and other means to show yourself as involved and up-to-date on your professional field. When I was job-hunting about six months ago, is was essential.
I don't necessarily agree.
It's one extra profile that you need to keep track of and keep updated, which I find kind of annoying. A resume is easy, you just update it each time you are looking for a new job...but with Linked in it's dynamic and always up there, so you kinda NEED to keep maintaining it, which can be a pain.
It's also annoying getting the constant notifications from people who want to link to you, people who have endorsed you, etc. I'm sure you can probably turn that off, but it's annoying regardless.
Finally it's yet another account to manage. Between banking, forums, work IT systems, phone accounts (and all the rest) there are so many bloomin' user accounts and passwords that people need to keep track of now days. The more that quantity grows the higher the risk that people will start forgetting passwords, in which case people start to follow bad security practices (like using the same password for everything, or writing their passwords down somewhere).
Having yet another account to manage is something I see as a negative. I do have a Linked-In account - keeping it up to date and ignoring the constant notifications frustrates me to the point where I've seriously considered deleting in on a number of occasions. I just don't have time for all that crap.
Regarding the OP term "sketchy", I think that is an extreme term. I think "out of touch with modern trends of communication" is more like it.
I wouldn't even say that.
Just because somebody chooses not to use social media, doesn't mean you are out "of touch with modern trends of communication".
I work in IT as a trade, I am perfectly in touch with modern trends of communication - I have to support them at work on a daily basis.
I simply choose not to use them because:
a) They provide me with little or no practical benefit
b) They can be annoying and distracting
c) I have more important things to worry about
I really don't see why anybody should be in any way judged based on whether or not they use social media. I think that is utterly ridiculous, and is no different to judging somebody based on whether or not they own an iPad.
Not having social media is not the same as not being social - it just means you live your social life through other avenues (i.e. through phone calls, messages, skype i.e. actual person-to-person interaction).
How I live my social life shouldn't make a difference in the world to anybody but me - just like it shouldn't make a difference whether I browse the internet via a table, a phone or my PC. I'm still on the internet, just doing it in a different way.