I disagree completely. I think there's far too much paranoia about these sort of things. He didn't post his address or anything. Sure, a real enterprising person with time and hacking skills might be able to correlate it to personal info, but anyone who wants to prey on kids can find easier targets.
I posted videos of my baby daughter on Youtube to share with family. Password protecting them means massive headaches coaching elderly family through the process of logging on. It's just easier not to. I gave it careful thought and decided the risk was less than just walking through the mall with her.
Just my opinion, of course.