I don't know. If I found out my kid was publicly expressing himself as planning to "beat some ho's", I would be so shocked and disgusted. Tiff and I were both horrified at the kind of vicious, offensive posts being slapped up on the Amanda Todd FB memorial site (recent bullying suicide victim, for those who aren't familiar) by very young teens. I really don't think a lot of those parents have any idea how their children are using social media. I think that dad was trying to teach his son that the power of self-expression comes with the responsibility of respectful posts, especially if you are making your FB profile public. I think he probably was trying to fight back with the tools his son would notice. The other alternative, and probably the one that would have ticked off the boxes of teaching a lesson and still leaving the kid a shred of dignity, would have been to shut down the account and remove the access to the computer.
It is going to be our big parenting challenge, I think: this dance between allowing our kids self-expression and freedom to explore/learn online and protecting them from/teaching them about the perils of this age of impulsive, imprudent social media. When we did stupid stuff as kids, it was usually forgotten about pretty quickly. Now, stupid teenage posts are immortalized online and will come back to haunt these kids. Not to mention how disturbing it is to see kids be so vicious to each other behind a screen. It's a big problem and we'll have our hands full coping with it.
I think this dad was just trying to do that - cope. Cope with an entity that is huge and changing faster than we can possibly hope to keep up with it. I think I would rather see a parent do something about such inappropriate posting rather than watch all these kids grow up thinking such disgusting public statements are somehow consequence-free and okay.