When Thessa’s birthday was coming up, she decided to throw a party. After all, it wasn’t every day a girl turned 16!
So, as many kids do these days, Thessa posted an invitation to her party on Facebook. She wanted all of her friends to come.
But she made a big mistake. She forgot to set her Facebook invitation to “Friends Only.”
More and more people saw the invitation and signed up to come to the party.
They sent it to their friends and told more people about it… and before long, more than 15,000 people had confirmed on Facebook that they were coming to the party.