We hear a lot about "Big Data" these days, but what the heck is it and why should you care?

We hear a lot about "Big Data" these days, but what the heck is it and why should you care??? Here's the best explanation I've seen thus far...  #xl  
http://www.linkedin.com/today/post/article/20130527063838-64875646-what-the-hell-is-big-data?trk=mp-reader-card