It can all be reasonably safe with the right precautions. IIRC my organization specifies what can be used for official communications, and I'm not sure even plain old email is listed. It is extremely handy, though, for times when events change or are relocated. I remember it being a huge time saver for officers when intramural games got moved, for instance, and more people were likely to show up than if they were emailed.
However chapters should be very careful to make their groups totally private. That way, the member list and any other such info is hidden unless you are approved to join.
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