About seven years ago I met my wife on OkCupid. The only reason why I messaged her back (after had messaging with her several months earlier) was because of the frontend visitor feature. She had visited my profile randomly again. Turns out she said she accidentally clicked on to my profile intended to see someone else. I haven't used OkC since then, but I thought I'd share that in the context of this blog post ;-)
One day when you have kids, you can tell them "you are the result of a mistaken web click"
Pet peeve of mine, but too many people don't even think about it and just procreate because it's part of the Standard Life Script™.