well i have a short story about how linkedin has helped me "advance my career" in a sense...
i've always wanted to try and come up with an app or software that i could work on and be my own, and make my own company. however i've struggled to come up with an idea i thought would take off.
i listened to a podcast about entrepreneurship that pointed me in the direction of founderdating.com. in order to sign up for that, you had to have a linkedin account. so that is what made me create a linkedin account.
after on linkedin i was browsing the entrepreneurship group and came across a listing for another site similar to founderdating.com, which is founder2be.com. so i signed up to that as well.
to make a long story short, a few weeks later someone contacted me from there and we are now working on a major side project that we are (all 3 of us) hoping can become a huge thing and can become our fulltime job. we're going to be putting out our app this year and have a marketing plan already in place and we all believe strongly that it can be the next big thing in it's genre. i own 29% of the company that we have started so i hope it does turn out huge.
so without linkedin, i don't know if i ever would have gotten the opportunity that i currently have, although it wasn't directly conneting with someone on linkedin that helped me out. but without getting in the group on there i don't know if i would have found out about the other site.
i have also been contacted by many recruiters on linked in since i've signed up, and i plan on using the connections if/when i move on from my current job if my side project does not pan out.