This is so true, i also believe that facebook is killing your productivity...
I install an app 1 year ago, that shows me how muach i use any of the apps on my phone that day...
And the results was that i used facebook for 4 hours and if you'd asked me before i would proabably told you 10-20 min :)))
We don't even know how much we use it
Thank You!
You are right!