I just had coffee with Greg Shepherd. He coordinates the Dining and Activity Network in Melbourne. What a delightful fellow. I was asking him about which activities his social club members seem to love the most and surprisingly he said walking was best for building community. As Greg explained, walking enables a group of people to clump into small groups and talk without being forced in an intense face to face meeting. When you tire of one conversation you can easily slow or quicken your pace to join a new clump. This probably explains why the blog walks are popular.