Facebook lesson of the day: If you’re creating a party invitation, make sure you keep it closed to the public. A girl in Australia learned this lesson the hard way, and had to cancel her 16th birthday party after almost 200,000 people reportedly accepted an invitation to her birthday bash, according to AFP . The girl initially just wanted her friends at school to come to her party, and figuring it could be a time saver, created a quick invite on Facebook saying anyone could attend — they could even bring friends if they let her know about it ahead of time. It’s an “open house party as long as it doesn’t get out of hand,” she wrote in the invite, according to AFP. Well, her party got out of hand all right — it went crazy before the festivities got a chance to start. The police said the party invitation went viral after it was reposted by another person, and soon the teen was bombarded with calls and text messages from complete strangers. The girl ...