This was something that we used to use in our college drama tream. It is a group prayer designed to 1) have everyone in your group prayed for and 2) have everyone in your group pray aloud.
Here is how it works. One person will say something that they would like the group to pray about. Then someone else volunteers to pray for that person. The volunteer then shares a request and a second volunteer then prays for the first volunteer. This continues until everyone has prayed for someone. It will only work if the first person who shared a request is the last person to pray. That way it makes a complete web.