Android/iOS: LinkedIn connects you with lots of professionals, but it doesn't offer a great way of finding out who you actually ought to spend time networking with. CanWeNetwork connects to your account and analyses those connections to figure that out for you.
All you do is connect your LinkedIn account and wait for CanWeNetwork's suggestions. You'll receive a number of related suggestions -- mine were relevant not only to what I do but to other interests as well -- along with a match percentage to let you know which ones are the best. On top of that, you can view other contacts near you, keep an eye on your profile, and, of course, contact anyone you want to network with. CanWeNetwork is free to use and accomplishes what ought to be LinkedIn's flagship feature.