Odd that the product page for Lightbeam makes no mention of the granular blocking feature. It's almost like they don't want to advertise that, rather calling it a visualisation tool.<p>Not until you install it and take a look do you find that blocking any particular site is easy to do and manage.<p>I've noticed a few sites I regularly visit are faster now that I've blocked some of their third party tracking and advertising crap with lightbeam. I've even blocked facebook.com and facebook.net, I hate their stupid junky web page widgets cluttering the web. Now I'm finally rid of it. Sure, I can't visit Facebook at all, but that's a small price for not seeing any of their crappy like buttons on the web anymore.
I disabled this plug-in months ago because I was not too interested in who is watching me (of which I know - google analytics, facebook, and most importantly the NSA). I was rather more interested in blocking their APIs, scripts, e.t.c. Hence, I began to use reactive mechanisms - plugins like HTTPS Everywhere, Privacy Badger, RefControl and Ghostery. I know they are intertwined (i.e. some doing the same work). But I prefer that approach to a listing or graphical visualization of who watches me (with little of no (re)action).