An accidental double-sending of a message on Facebook chat due to a chat error. Happens way too often.
Jon: "Hi!"
Anna: "Hey there!"

"Hey there!"
Anna: "Ugh. Sorry. Facebook echo."
Jon: "Facebook lives in a cave."
by Tomi V. October 21, 2010
Get a Facebook echo mug for your sister-in-law Jovana.
The repeating of facebook status updates and wall posts
"Man if I see roger put carpe diem up as his facebook status I might vomit."
"Total facebook echo"
by appa momo January 05, 2010
Get a facebook echo mug for your grandma Riley.