If you host a Facebook group, you probably wonder how to gain more members and where to promote your group. I was exactly in this situation, not long time ago when I started my own group. The first couple weeks are the hardest one to gain members and engagement. Not so many people want to join a group with only a few members. After the first month, I only had 69 members in my group. Now, I can easily add 50-150 members every week.