facebook know 

"Facebook know" means to know someone only through Facebook. You've never met, talked or texted, but you know many details about each other through posts that appear in the other person's feed and replies to those posts.

I've never met Jim, but I Facebook know him very well.

facebook know by circlesofindecision January 28, 2017

facebook know it all 

People on FB that think they know everything and consult other FB people on religion, politics and other topics. In reality these people really don't know shit.

A Facebook know it all..... " John, the Bible never said anything about homosexuality, let me lecture you more on shit I don't know about.... "

facebook know it all by Alan Prokop December 22, 2013

Know by Facebook 

When you recognize the name of someone in a conversation, but then realize that you only know them through facebook and have never actually met.

Disclaimer: Admitting this could cause you to sound like a creeper.

Person 1: Sorry we couldn't hang out, I was studying with (Insert Name) last night. Do you know him?
Person 2: Hmm, not by face, but I might know by Facebook.
Person 1: So that's a no?
Person 2: Pretty much.

Know by Facebook by Rockinroller September 3, 2010

Facebook Knowledge 

When you know something about someone before they tell you face to face due to their facebook post.

hey man how was Hawaiin Falls?

How did you know I went to Hawaiin Falls?

Facebook Knowledge bro.

Facebook Knowledge by thatguy7765445 July 4, 2010