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Why do people place bumper stickers on their window?

Bartłomiej Pękala
Bartłomiej Pękala, CEO at Vleporama.com (2009-present)

For fun

for tuning

for advertising purposes

Question has been asked on https://www.quora.com/Why-do-people-place-bumper-stickers-on-their-window/answer/Bart%C5%82omiej-P%C4%99kala