People are obviously too lax with their social media. And it’s not just teenagers who aren’t safe online.

Sure, it may feel good to tweet and Instragram your lunch and birthday plans, but now the whole world knows.

To demonstrate how dangerous social media can be, prankster Jack Vale used a Twitter app at the boardwalk to check out people’s tweets in his immediate area and freaked them out a bit.

After checking their names and pictures, he casually walked up to complete strangers, and greeted them by their first name as if he knew them. He even asked personal questions, and wished some people happy birthday.

Naturally, they were all freaked out.

Let this be a lesson to you.