In iGap app, also you can have groups in private or public, but you can convert them private to public or vice versa and apply new possibilities. Remember, in order to have a public group, you have to create a private at first. Then by converting to a public one, and adding new and/or unknown members get familiar with more iGap users.
In iGap messaging application in Web version, you can have a private group to chat with your friends and any known member using iGap. In this kind of group all members are able to send messages and see others', but to add a new member only the creator or admin is able to do. So, it's the time to create a private virtual space with your friends and enjoy chatting.
You can create new groups in iGap using the option New Group and control and administrate it easily. In both Web and Android version, you are able to have either private or public ones. It's possible to have a private group with your friends known to each other or a public group in order to make new friends and get acquainted with more people.