When I started my first Discovery Bible Study I expected that the non-Christians would quickly start new groups with their friends.
I was in for a shock. That didn't happen.
I went back to re-read the stories of rapid DBS expansion. Most of these came from rural villages or from people groups which have a high sense of community.
Rapid expansion in the city is still possible. But you need to do it differently.
I work from home, most of the time in a room by myself. I'm connected to my team and the rest of the world through the internet.
So I am reading my Bible while eating my breakfast and come across a most disturbing verse: That same day Jesus went out of the house and sat by the lake. Such large crowds gathered around him that he got into a boat and sat in it, while all the people stood on the shore. (Matthew 13:1-2)
Jesus had a full-blown ministry in the house. But he left there so that others could hear.
It is a bit different from the standard outline. Normally we do not allow people to hyperlink. We print out a page with the questions and Bible passage for the evening and limit our discussion to what is printed. This keeps us from waundering out to people's favourite Bible passages. It also provides a level playing field so that everyone can participate in the discussion.