With ballots out in the mail, you’ll soon start seeing people wearing those "I Voted" stickers, or updating their profile pictures to show they went to the polls. Turns out, there’s actually some crafty psychology behind saying "I Voted."

Psychologists say people want other people to think they did their civic duty, mainly for one of two reasons. First, they want to be included, and second, they don’t want to be publicly shamed for not fulfilling their civic duty.

9NEWS psychologist, Dr. Max Wachtel, says people want to act like they’re involved.

“There are these two sides, the positive, I want to be included, I want to be in the part of I did my civic duty, and then there’s the negative side. The ‘I don’t want to be the person who doesn’t, I don’t want to have that public shame."
"That negative side may come out a little more in this particular election, when people aren’t super thrilled about either candidate, where you may see a sticker and think, ughhhh, I really don’t want to vote, but I don’t want to be the doofus that doesn’t, so I’m going to get my sticker, and then I don’t have to be humiliated."

You’ll no doubt see the same "I Voted" sentiment on social media up until Election Day.