How Well Do You Know Your Facebook Friends?

We all have Facebook friends with certain tells in their choice of status updates. There are the unabashedly peppy, the unrelenting complainers and the 800-word posters. To test how well you can identify your Facebook friends by these clues, we’ve built a simple quiz: This app will randomly select status updates from your recent newsfeed and present you with five possible authors for each one. (Note: This will not work for all users due to differences in privacy settings. If you’re asked for your password, you’ll be logging into Facebook. TIME is not recording or storing your password.)

Research suggests that a lot of our offline personality can shine through on Facebook, even if most of us complain about our friends’ behavior online. (And don’t delay. Facebook will soon be shutting down the service that lets us make apps like this one or the classic “How Much Time Have You Wasted On Facebook?”)

Read next: Find Out Which of Your Facebook Friends Makes You the Happiest