When a friend on Facebook sends you a message you can clearly see it at the top left of every page. When other people, whom are not directly connect to you, sends you a message it ends up in a secret box.
While writing an article about Facebook lists I was testing my groups. Clicking through the updates of my groups in the favorites I clicked on ‘Messages’ and ‘Other’.
There I saw it, messages from the last 4-5 months that I had completely missed. People asking questions, one potential client, attendees of my webinars that asked me to join the group.