Download this app if: you want the official business networking app.
LinkedIn for Android goes mobile with your business contacts — Facebook users include just about everyone you know and anyone you might ever imagine knowing, but through that tool you're more likely to find photos of their kids and bulletins of what they had for dinner, rather than assistance finding a job. If you want to network for business, use LinkedIn....
The LinkedIn app makes it easier to connect to the people and things that matter in your professional world. Build and nurture your professional network, stay up to date with the latest business and industry news, and find your next dream job.
It all starts with your LinkedIn profile. It’s more...
LinkedIn is THE social platform for business — LinkedIn has come a long way in the app world. When it started it was frankly awful, but now you can do many of the same things as on the web, including easily replying to messages. I don't use this app as much as the others but it works well when I do.