I think I would have liked facebook, or at least social media and interconnectivity to have been around when I was a kid. I was very shy and had a very hard time making friends. I would think with the internet, keeping in touch with friends and finding activities that interested me would have been easier.
Now that I am 36, I have no desire whatsoever to have a facebook. And I have a 16 month old daughter who means everything to me. and I still don't feel any desire to post pictures of her on the net. I take more pictures than a Japanese tourist, but I just send them to our parents and siblings. If anyone asks to see some, or if she comes up in conversation, I will email them some.