Glad to hear that you know what you are doing.
As the people on Gransnet are not clients, but friends, and all the meetups I have been at have been with several people and in very public places, I have never bothered too much with checking out their credentials. Of course, most of them have been with posters who already knew one another from exchanging friendly views on all manner of subjects, just like people you would meet in other circumstances. If I had been advertising to meet a stranger with a view to close friendship and private comunications it would have been different.
I hope you find that Gransnet is what you are looking for, and are not disappointed.