To erase unwanted or unneeded people on your facebook friends list. Usually a result of having 300+ friends but only talking to a fraction of them. Basically a friends cleanse but exclusive to Facebook.
I decided to have a Facebook cleanse, now my friends list is only half it's original size.
To have a high amount of courage behind a computer screen (or over the internet in general) that would otherwise not be followed up or said in person. Such occurrences can include insults and arguments in general. Not being able to follow up to threats previously made online in a real life scenario also apply. Also see: internet balls
A: You are such an idiot, I hate you.
B: Why don't you come here and say that to my face?
A: Make me.
B: Clearly you have a strong case of "Internet Cajones"