I would like to briefly explain different options to invite users to a group, as it may not be completely evident the first time.
There are two main mechanisms to invite users through the system. You can also use other external mechanisms to invite people, which lately is my preferred choice. As evident as it may sound, the first thing that we need to take into account is that whoever wants to join a group needs an account in the site. Depending on that, we have different options:
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