Facebook sing
Putting song lyrics on your Facebook page like you're trying to impress someone. Or getting someone else to join in like you're both stupid and bored.
@jimmy posted the whole chorus of 'Blinding Lights' and now everyone's singing it in the comments.
Liz and Mark did a Facebook sing of 'Hey, Hey, Hey, Good Looking' and it took 20 comments to finish.
My cousin posted the first line of 'Don't Stop Believin'' and now my whole family is arguing about the next line.