The Math (and use?) of Linkedin?

I am a newbie to Linkedin.

In fact, I didn't want to join yet another social network (same connections, new passwords = ugh!)

But it seems that it might be a good idea to join, set up a professional network as I look to spread out my wings a little and try towards new horizons.

So I looked around and saw this info graphic ( I like to work these things out via NUMBERS ).

From: http://blog.hubspot.com/blog/tabid/6307/bid/6147/LinkedIn-by-the-Numbers-Infographic.aspx

Still I am not convinced of the role that Linkedin has for education.

If you know, please clue me in.

Along the way: connect with me via twitter: pepepacha

Thanks