English language group. This is a group of about 140 people, from 21 countries and 6 continents ,who form a cyber-group.
Membership is open to anyone wishing to join.
Any group member can respond to the message and in this way a discussion takes place. Members participate as frequently, or infrequently as they wish. Members are reminded once a year when payment is due. This operate in a similar way to the English language group above. I have heard that it is safe and not subject to spamming, but I have no personal experience of it.