I've noticed when on ksat or any of these news channels have trackers for their links.
I was on Facebook reading a article it shows in the top left corner(using Facebook app) how many ppl have shared. It was the exact number count. I'm sure just like when other people share our statuses it informs us if that activity.
The other day the news said THEY WILL INFORM police about comments and things they see on comments. This isn't a surprise for most but still be careful what you say and share on internet.