Probably easier just to do it for everyone in the Facebook TechCrunch network, though it's possible that they used IPs.
Re:Yeah Ok, So Facebook Punk’d Us
by JacobAldridge on Friday September 11, 2009 @12:20AM
(#816842)
That's a fair point. I guess my initial reaction was 'this is funny, but does that justify the means?'.
If it's easy enough to do then the means aren't controversial. Punk on!
But everyone in the TechCrunch network saw it
I'm not sure if that means TechCrunch's offices' subnet, or the Facebook network. But either way, no big invasion of privacy.