You’ve never seen them in person…or through a computer screen
Well duh! This is the most obvious sign, so let’s get it out of the way right now. In the days when a face-to-face meeting is nothing more than an internet connection away, there’s no reason why you shouldn’t have had a Skype, Facetime or Google + session. It just doesn’t make sense. Now, if your preferred method of communication has been strictly verbal, and they claim they don’t have an internet connection, you need to suggest they head to their nearest Starbucks, library or internet cafe. If they can’t make that happen, well then you know the deal.