"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.
by circlesofindecision January 28, 2017

Jennifer: OMG people keep myspacing facebook!
Valerie: Like, how?
Jennifer: Max Lovespandas...what kind of name is that?
Valerie: Like, how?
Jennifer: Max Lovespandas...what kind of name is that?
by peanutjane May 1, 2011

A website or app that is full of cringy ass bullshit
Yo bro, I cringed so damn hard when I saw that shit my Uncle and his immature friends posted on Facebook - Jason
Yeah, Facebook is also known for making their users say they have 3,000 friends, but those are fake friends for them because they never fucking met them and don’t know where they live. Facebook should be called Fuckbook - Greg
Yo bro, I cringed so damn hard when I saw that shit my Uncle and his immature friends posted on Facebook - Jason
Yeah, Facebook is also known for making their users say they have 3,000 friends, but those are fake friends for them because they never fucking met them and don’t know where they live. Facebook should be called Fuckbook - Greg
by DunkinDonutsSavage7233 December 19, 2023

Someone who posts or shares certain posts on Facebook (usually derogatory or insulting) with the intention of a targeted person seeing it. (Target being someone in their life)
"Karen is such a facebook missile, we all know who she's talking about when she shares posts about unemployment"
by Dumbledoresnan April 27, 2024

A sincerely lonely individual that roams Facebook for any and all posts that need to be liked!!! Watch out cause tricky bastards get you every time!!!!
by Schrades January 25, 2015

When Facebook punishes you by placing sanction(s) on your account to restrict what you can do instead of just putting you in Facebook Jail.
"Why didn't you comment on my post bro"
"I can't. I'm on Facebook Probation and can't comment on any posts until Monday"
"I can't. I'm on Facebook Probation and can't comment on any posts until Monday"
by Ubeenbamboozledson March 12, 2022

John got tired of all the shitty content in his feed so he performed a Facebook Apocalypse last night
by sociallittleman June 5, 2018
