Not necessarily true that there is some big shameful thing that has people hiding from the world.
I consider myself to be a normal well-adjusted person with no big shameful secrets....lol. I brush my teeth, stay active and fit, don't have any annoying habits, no addictions, no shameful past to cover up (other than the fact that I am divorced), no secret vices, no criminal history and I shower daily and don't snore.
I looked to the internet for dating sites because I was not meeting people through my young son's boyscout troop, nor at the supermarket, nor at the bank, nor at my church "single's group" nor throught the hiking group I joined, nor through any other activity that I do on a regular basis (including my work site...).
I think there are a lot of weirdos and losers on those dating sites, though, so I do caution people to be VERY careful and VERY selective...use all safety precautions, don't readily hand out phone numbers and personal info, meet only in public places during the day, etc, etc....