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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
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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
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