The practice of, when you see a song lyric on Facebook or another social networking website, singing the next lyric. Usually someone will add a third, then a fourth, and so on.
(originally coined by Sethual Chocolate)
Jeff Smith says I believe I can fly
John Jones says I believe I can touch the sky
Kim German says I think about it every night and day
Phyllis Seymour wants to spread my wings and fly away
Andrew Rickenbacker just doesn't understand all this facebook singing.