So what exactly was threatening in the exchange, other than belatedly realizing that Rudy was a guy and not a gal? I feel like I'm missing information or just not getting the point of the original post.
As for facebook-- set your profile to private. Never put your phone or home address anywhere on FB, and don't friend anyone you don't know from real life venues. Problem solved.
Going all reactionary and scared about the internet is a little silly, really. Most of that information has long been available in public records, accessible to anyone who knew how to use a library or a city hall. Only difference is that now it's easier to do from home.
RST
RST