... I don't find it suspicious, I find it reassuring that there are people out there who still have a sense of privacy....

There are a lot of episodes where someone thinks they talking to a model, or a rapper, or something like that. But then the model/rapper/whatever has a "normal" amount of friends and/or not many photos. And I think it is suspicious in those cases because I would expect a model to post lots of pics or at least not be camera shy or whatever, and I'd expect a rapper who was not huge but maybe a kind of a big deal locally to have some local fans following them or "friends" who are in the business, etc.

I think most of the people on the show are younger too. And I think it's more common than not for young people to post selfies, to have a cell phone, to have lots of online friends/followers, etc.

But I don't think it's suspicious for regular/not famous people to not do those things, especially as adults. I don't have a whole lot of pictures of myself on facebook because I'm not really into selfies, and not many people take pictures of me. And I would have fewer friends, but I admin some facebook groups with some other people, so we've all added each other.

Hm, can't say I am familiar with the show at all, but I guess it is a good point that someone who chose a public career path that is dependent on publicity would have more going on in social media.

I'm usually carrying a book around like a security blanket for adults, so I can fiddle with the book for something to do with my hands.... but yeah... wanting to maintain some privacy as a -ahem- private citizen- is not creepy, it's just sensible.

I don't think it's unusual at all to be more reserved. I think the message the show are trying to send is that if someone is going to interact with you they are probably a more outgoing person and will probably have more friends if the account is real. A more sociable person will probably have more friends than a introverted person, cuz we are really picky.
I for one am also quite introverted, I haven't posted a picture on facebook in 5 years, I'm still cleaning my friends list, cuz I don't even know some of them, but I'll also never think of randomly talking to people and asking them out on a whim. I think that's when the show wants people to think twice if something is not suspicious.
But to be honest, I know the threats of that show are real, but the show itself looks so practiced, I don't buy those stories to be real.

I hope I'm not oversteping, but I would like to add is that you shouldn't feel ugly. How much of you you want to share with the world is your decision, but I think is very important to appreciate yourself and someone as kind and attentive as you really shouldn't think of themself as ugly.