I don't care what friends of my friends think.
I clicked "like" on something one of my friends posted yesterday. Throughout the day I continued to be notified of new "notifications" that someone had commented or liked the thing that I liked. These were people I do not know, have no reason to know, and do not care what they are doing.
I don't want to know if 500 other people "like" what I just liked. And even if I did, I don't want a stupid notification about it from the Facebook app on my phone every time.
I DON'T CARE.
I even turned my iPhone notifications to only show Badges for Facebook. Even that is annoying if I have to put up with this crap all of the time.